JP7647073B2 - Optometry Systems and Programs - Google Patents

Description

The present disclosure relates to an optometry system and an optometry program for subjectively measuring the optical characteristics of a subject's eye.

In the optometry system, a subjective optometry device is used that subjectively measures the optical characteristics of the subject's eye. For example, a subjective optometry device measures the optical characteristics of the subject's eye by placing an optical element in front of the subject's eye and presenting a visual target to the subject's eye via the optical element (see Patent Document 1).

Japanese Patent Application Publication No. 5-176893

Recently, for reasons such as the desire to efficiently examine many subjects, there has been a demand for a system that allows subjects to easily perform subjective examinations of their eyes. The inventors therefore investigated so-called self-eye examinations, in which subjects conduct their own eye examinations. It was thought that performing a self-eye examination would create an environment in which it would be difficult for the subject to communicate with the examiner, and that in some cases this could result in inaccurate test results.

In view of the above-mentioned conventional techniques, the technical objective of the present disclosure is to provide an eye examination system and an eye examination program that can perform subjective examinations with high accuracy.

In order to solve the above problems, the present disclosure is characterized by having the following configuration:

(1) An eye examination system according to a first aspect of the present disclosure is an eye examination system for presenting a test optotype to an eye to be examined and subjectively measuring optical characteristics of the eye to be examined, comprising: a setting means for setting a reference value based on a reaction time of the eye to the test optotype; a response input means for inputting an answer by the eye to be examined of the test optotype; a control means for automatically progressing the examination based on an input signal from the response input means; and a guidance information output means for outputting guidance information for guiding the eye to input the answer based on the reference value set by the setting means during the examination of the eye to be examined . The guidance information output means is characterized in that if no signal is obtained from the response input means even after a predetermined time set for repeating the guidance information has elapsed, the guidance information output means repeatedly outputs the guidance information .

(2) An eye examination program according to a second aspect of the present disclosure is an eye examination program used in an eye examination system for presenting a test optotype to an eye to be examined and subjectively measuring optical characteristics of the eye to be examined, wherein the eye examination program is executed by a processor to cause the eye examination system to execute a setting step of setting a reference value based on a reaction time of the subject to the test optotype, a response input step of the subject inputting an answer on how the subject interprets the test optotype, a control step of automatically progressing the examination based on an input signal by the response input step, and a guidance information output step of outputting guidance information during the examination of the eye to be examined, the guidance information being output based on the reference value set in the setting step, and wherein the guidance information output step is characterized in that if no signal is obtained by the response input step even after a predetermined time set for repeating the guidance information has elapsed, the guidance information output step repeatedly outputs the guidance information.

1 is an example of an optometry device included in an optometry system. FIG. 1 is a schematic configuration diagram of the inside of an optometry apparatus as viewed from the front. 1 is a schematic configuration diagram of the inside of an optometry apparatus as viewed from the side. 2 is a schematic configuration diagram of the inside of the optometry apparatus as viewed from above. FIG. FIG. 2 is a diagram showing a control system of the optometric apparatus. FIG. 1 is a diagram showing an example of a flow of a subjective examination of a subject's eye. 1 is an example of a monitor. 1 is an example of a graph showing the relationship between reaction time and correction power in a refraction test. 1 is an example of a graph showing the relationship between reaction time and visual acuity value in a naked eye visual acuity test. 1 is an example of an optometry device. 1 is a flowchart showing a detailed flow of a refractive examination. This is an example of the flow of a vision test.

＜Overview＞
An overview of an optometry system according to an embodiment of the present disclosure will be described. Note that the items classified in <> below can be used independently or in association with each other.

The eye examination system in this embodiment is an eye examination system for subjectively measuring the optical characteristics of the subject's eye. For example, the optical characteristics of the subject's eye may be at least one of the ocular refractive power of the subject's eye (e.g., spherical power, cylindrical power, astigmatism axis angle, prism amount, etc.), binocular vision function (e.g., prism amount, stereoscopic vision function, etc.), contrast sensitivity, etc.

The optometry system in this embodiment may include at least a subjective optometry device (e.g., optometry device 100). For example, the subjective optometry device can subjectively measure the optical characteristics of the subject's eye by projecting a visual target light beam toward the subject's eye and changing the optical characteristics of the visual target light beam. For example, the subjective optometry device may have a visual target presenting means, a correction means, etc., which will be described later. In addition, for example, the subjective optometry device may have a response input means, which will be described later.

<Target Presentation Means>
The eye examination system in this embodiment includes an eye target presenting means that emits an eye target light beam toward the eye to be examined.

For example, the optotype presenting means may be a display (e.g., display 31). Also, for example, the optotype presenting means may be a light source and a DMD (Digital Micromirror Device). Also, for example, the optotype presenting means may be a light source and an optotype plate.

For example, the visual target light beam from the visual target presenting means may be emitted directly toward the subject's eye. Also, for example, the visual target light beam from the visual target presenting means may be indirectly guided toward the subject's eye via a light projection optical system (for example, light projection optical system 30). For example, the light projection optical system may have at least one optical member through which the visual target light beam emitted from the visual target presenting means passes. As an example, it may have at least one of a lens, a mirror, etc.

The optometry system may have an optotype presenting means as a part of the components constituting the subjective optometry device. In this case, the optotype presenting means may be provided in the subjective optometry device. The optometry system may also have an optotype presenting means as an optotype presenting device, separate from the subjective optometry device.

<Correction measures>
The optometry system in the present embodiment includes a correction means. For example, the correction means may include a correction optical system (e.g., a correction optical system 60). For example, the correction optical system is disposed in the optical path of the light projection optical system and changes the optical characteristics of the visual target light beam.

The corrective optical system may be configured to change the optical characteristics of the visual target light beam.

As an example, the correction optical system may have an optical element, and the optical characteristics of the visual target light beam may be changed by controlling the optical element. For example, the optical element may be at least one of a spherical lens, a cylindrical lens, a cross cylinder lens, a rotary prism, a wavefront modulation element, a variable focus lens, and the like. Of course, the optical element may be different from these.

As another example, the correction optical system may change the optical characteristics of the visual target light beam by optically changing the presentation position (presentation distance) of the visual target relative to the subject's eye. In this case, the visual target presenting means may be moved in the optical axis direction, or an optical element (e.g., a spherical lens, etc.) arranged in the optical path may be moved in the optical axis direction.

As another example, the correction optical system may have an optical element disposed between an optical member for guiding the visual target light beam from the light projection optical system toward the subject's eye and the visual target presenting means, and the optical element may be controlled to change the optical characteristics of the visual target light beam. In other words, the correction optical system may be a phantom lens refractometer (phantom correction optical system).

As another example, the correction optical system may change the optical characteristics of the visual target light beam by switching and positioning the optical elements placed in front of the subject's eye. That is, the correction optical system may be an eye examination unit (phoropter). For example, the eye examination unit may have a lens disk on which multiple optical elements are arranged on the same circumference, and a driving means for rotating the lens disk, and may be configured to electrically switch the optical elements by driving the driving means (e.g., a motor).

<Response input means>
The eye examination system in this embodiment includes a response input means. The response input means is a means for the subject to input a response to interpreting the test optotype. For example, the response input means may be an operating means (e.g., subject controller 8) such as a lever switch or a push button switch. The response input means may also be a voice input means such as a microphone. The response input means may also be a detection means for detecting the movement of the subject's line of sight or gestures.

<Means for acquiring reaction time>
The optometry system in this embodiment includes a reaction time acquisition means (e.g., the control unit 70). The reaction time acquisition means acquires a reaction time required from the start of measurement to a response based on a start timing at which measurement of the subject's eye is started, where the optotype presenting means or the correction means is controlled by a control means described later, and a response timing that is later than the start timing, where a response signal to the measurement is input by a response input means (e.g., the controller 6, the subject controller 8).

For example, the start timing at which measurement of the subject's eye is started may be the timing at which a start signal that serves as a trigger for controlling the optotype presenting means or the correction means is acquired. For example, it may be the timing at which a start signal is automatically input based on an eye examination program or the like. It may also be the timing at which a start signal is input by the examiner operating an operating means (e.g., the controller 6). It may also be the timing at which a start signal input by the examiner operating an operating means is received.

For example, such a start timing may be the timing at which each measurement is started during the process of measuring the test item for the test eye. More specifically, it may be the timing at which either the optotype presenting means or the correction means is sequentially controlled during the process of measuring the test item. For example, it may be the timing each time a start signal for switching the optotype is input or received during the process of measuring the test item, or each time the optotype is switched based on the start signal. The timing at which the optotype is switched may be the timing at which the visual acuity value of the optotype is switched, or the timing at which the type of optotype is switched. Also, for example, it may be the timing each time a start signal for switching the correction power for correcting the test eye is input or received during the process of measuring the test item, or each time the correction power is switched based on the start signal.

Furthermore, for example, such a start timing may be the timing when the measurement of the test item for the test eye is started. More specifically, it may be the timing when either the optotype presenting means or the correction means is first controlled to start the measurement of the test item. For example, in the measurement of the test item, it may be the timing when a start signal for switching the optotype is first input or received, and the optotype is first switched based on the start signal. For example, in the measurement of the test item, it may be the timing when a start signal for switching the correction power is first input or received, and the correction power is first switched based on the start signal.

For example, the response timing at which a response signal to a measurement is input may be the timing at which the response signal is acquired based on the operation of the response input means. For example, it may be the timing at which the response signal is input by the operation of the response input means. Also, for example, it may be the timing at which the response signal input by the operation of the response input means is received. The response input means may be operated by the examiner or by the subject. When the response input means is operated by the examiner, the response input means may also serve as the operation means.

For example, such a response timing may be the timing at which each measurement is completed during the process of measuring the test items for the test eye. More specifically, during the process of measuring the test items, the response timing may be each time either the optotype presenting means or the correction means is controlled sequentially and a response signal is input in response to this. For example, during the process of measuring the test items, the response timing may be each time a response signal is input in response to switching of the optotype, or each time a response from the subject is input. Also, for example, during the process of measuring the test items, the response timing may be each time a response signal is input in response to switching of the correction power, or each time a response from the subject is input.

Also, for example, the response timing at which a response signal to the measurement of the test eye is input may be the timing at which the measurement of the test item for the test eye is completed. More specifically, in the measurement of the test item, it may be the timing at which either the optotype presenting means or the correction means is last controlled and a response signal to this is input, or it may be the timing at which the test subject's response is input.

The above-mentioned test items may be the entire subjective test. The above-mentioned test items may be each test item in the subjective test. For example, they may be at least one of a naked eye visual acuity test, a refractive test, etc. For example, the refractive test may include at least one of a spherical test, an astigmatism test, etc. For example, the spherical test may include a red-green test, etc. For example, the astigmatism test may include a cross cylinder test, etc.

For example, the reaction time acquisition means may acquire the reaction time by measuring the time from the start timing to the response timing. That is, the reaction time acquisition means may acquire the reaction time by starting to measure the time based on the above-mentioned start signal and ending the time measurement based on the above-mentioned response signal.

As an example, the reaction time acquisition means may start measuring time at a start timing controlled by either the optotype presenting means or the correction means during the measurement of a test item, and end the time measurement at a response timing at which a response signal is input, thereby acquiring the reaction time for each of the optotypes and/or correction powers when they are switched sequentially. In other words, the reaction time may be acquired in real time during the test.

As another example, the reaction time acquisition means may start measuring time at the start timing when either the optotype presentation means or the correction means is first controlled in measuring a test item, and end the time measurement at the response timing when a response signal is input when either the optotype presentation means or the correction means is last controlled, thereby acquiring the total reaction time required to measure the test item.

For example, the reaction time acquisition means may acquire the reaction time by calculating the difference between such a start timing and a response timing. For example, the reaction time acquisition means may acquire the reaction time by starting to measure time at a predetermined timing, storing the times at which the above-mentioned start signal and the above-mentioned response signal were obtained, and calculating the difference between these.

As an example, the reaction time acquisition means may acquire the reaction time for each of the optotypes and/or correction powers when they are switched sequentially during the measurement of the test item from the difference between the start timing at which either the optotype presentation means or the correction means is controlled and the response timing at which a response signal is input in response to the control.

As another example, the reaction time acquisition means may acquire the total reaction time required to measure the test item from the difference between the start timing at which either the optotype presenting means or the correction means is first controlled and the response timing at which a response signal is input when either the optotype presenting means or the correction means is last controlled in measuring the test item.

For example, the reaction time acquisition means may acquire the total reaction time by adding up the reaction times acquired for each test item during the measurement process.

For example, the reaction time acquisition means may acquire a first reaction time and a second reaction time acquired at different timings as the reaction time required from the start of measurement to a response. The first reaction time and the second reaction time may be different in at least one of the start timing and the response timing.

For example, the reaction time acquisition means may acquire a first reaction time and a second reaction time at different start timings. As one example, it may be two or more reaction times in the process of measuring the test item. As another example, it may be a reaction time that includes the entire reaction time required to measure the test item and the reaction time excluding the start timing when either the optotype presenting means or the correction means is first controlled.

Also, for example, the reaction time acquisition means may acquire a first reaction time and a second reaction time at different response timings. As an example, it may be two or more reaction times in the process of measuring the test item. As an example, it may be a reaction time that includes the entire reaction time required to measure the test item and the reaction time excluding the response timing when either the optotype presenting means or the correction means was last controlled.

Also, for example, the reaction time acquisition means may acquire a first reaction time and a second reaction time at different start timings and different response timings. As an example, it may be two or more reaction times in the process of measuring the test item. As an example, it may be a reaction time including the entire reaction time required to measure the test item and the reaction time excluding the start timing when either the optotype presenting means or the correction means is first controlled and the response timing when it is last controlled.

Of course, for example, the reaction time acquisition means may acquire a time other than the reaction time required from the start of measurement to a response. As an example, the reaction time acquisition means may acquire the test time required for a series of measurements for a test item. In this case, the reaction time acquisition means may acquire the test time by combining the total reaction time required for the measurement of the test item with the operation time taken by the operator to operate the response input means. In more detail, for example, the test time may be acquired by combining the time from each response timing to the next start timing in the process of measuring the test item with the total reaction time required for the measurement of the test item.

<Setting method>
The eye examination system in this embodiment includes a setting means (e.g., a control unit 70). The setting means sets a reference value based on the subject's reaction time to the test optotype. In other words, a reference value is set as a standard for the time required for the subject to visually recognize the test optotype and to respond using the response input means (i.e., reaction time). For example, the setting means can change the reference value to a different value for each subject, taking into account individual differences in the reaction speed of each subject.

For example, the setting means may set a reference value for the subject's reaction time based on a signal input by the examiner operating the operating means. As an example, in this case, a list of multiple reference values may be displayed, from which any time can be selected. Also, for example, the setting means may set a reference value for the subject's reaction time based on subject information. As an example, in this case, the reference value may be set using a table or the like that associates subject information with reference values. Note that, for example, the table may be set in advance based on the results of experiments or simulations, etc. Also, for example, the subject information may be at least one of age, sex, etc.

For example, the setting means may set the reaction time acquired by the reaction time acquisition means as the reference value of the subject's reaction time. Also, for example, the setting means may set a time obtained by increasing or decreasing the reaction time acquired by the reaction time acquisition means by a predetermined time as the reference value of the subject's reaction time. Note that, for example, the predetermined time may be set in advance based on the results of an experiment or a simulation, etc.

For example, the setting means may be capable of setting a reference value based on the subject's reaction time according to the test item. That is, the reaction time reference value may be set according to a refraction test (red-green test, cross cylinder test, etc.) or a visual acuity test. In this case, for example, the setting means may set the reference value taking into consideration the test optotypes that differ for each test item. As an example, the reference value may be set to a larger value (longer time) as the number of test optotypes presented simultaneously increases. Of course, the reference value may be set taking into consideration the complexity of the test, the number of answer patterns, etc.

For example, the setting means may change and set the reference value of the subject's reaction time from a first reference value to a second reference value based on the reaction time acquired in real time by the reaction time acquisition means. For example, the second reference value may be a value different from the first reference value. As an example, the second reference value may be a value larger (longer time) than the first reference value, or a value smaller (shorter time) than the first reference value. In other words, the setting means may update the reference value that serves as the reference for the subject's reaction time based on the real-time reaction time obtained when at least one of the test optotype and the correction power is switched sequentially during the examination of the subject's eye. In other words, the reference value may be optimized as appropriate during the examination of the subject's eye. Thereby, the reference value for the subject is changed each time according to changes in the subject's reaction speed.

In such a case, the setting means may optimize and set the reference value based on the number of times the reaction time is acquired by the reaction time acquisition means. For example, the reference value may be updated each time the reaction time acquisition means acquires a reaction time (i.e., every time). Also, for example, the reaction times acquired multiple times by the reaction time acquisition means may be averaged and this may be reflected in the reference value.

<Status Acquisition Means>
The optometry system in this embodiment includes a status acquisition unit (e.g., a control unit 70). The status acquisition unit acquires the status of the optometry system when the optotype presenting unit or the correction unit is controlled by the control unit described later.

For example, the state acquisition means may acquire the state of the optotype presenting means when the optotype presenting means is controlled by the control means. Also, for example, the state acquisition means may acquire the state of the correction means when the optotype presenting means is controlled by the control means. Also, for example, the state acquisition means may acquire the state of the optotype presenting means when the correction means is controlled by the control means. Also, for example, the state acquisition means may acquire the state of the correction means when the correction means is controlled by the control means described below. Of course, a combination of these states may be acquired.

For example, the state of the optotype presenting means may be at least one of the states of the type of optotype presented to the subject's eye by the control means controlling the optotype presenting means, the state of the visual acuity value of the optotype, etc. For example, the state of the optotype presenting means may include the number of times (frequency) the type of optotype is switched, the number of times (frequency) the visual acuity value of the optotype is switched, etc. Also, for example, the state of the correction means may be the state of the correction power of the subject's eye corrected by the control means controlling the correction means. For example, the state of the correction means may include the number of times (frequency) the correction power is switched, etc.

<Determination Means>
The optometry system in this embodiment includes a determination unit (e.g., the control unit 70). The determination unit determines whether the state of the optometry system acquired by the state acquisition unit is appropriate based on the reaction time acquired by the reaction time acquisition unit.

For example, the judgment means may judge whether the state of the eye examination system is appropriate based on whether the reaction time exceeds a preset first threshold. For example, the first reaction time threshold may be set from an experiment, a simulation, or the like. Also, for example, the first reaction time threshold may be set based on the average reaction speed of humans. Note that in this case, the first reaction time threshold may be set for each age. Of course, it may also be set for each item other than age. Also, for example, the first reaction time threshold may be set based on the reaction speed of each subject (i.e., a standard value for reaction time may be set for each subject). Note that an acceptable range may be set for the first reaction time threshold.

For example, the determination means may determine whether the examination of the subject's eye is being performed well as the appropriateness of the state of the eye examination system based on the reaction time acquired by the reaction time acquisition means. As an example, the determination means may infer that the subject can see the optotype correctly based on the reaction time and determine that the examination of the subject's eye is being performed well. More specifically, for example, if the reaction time is comparable to the first threshold value, it may be determined that the subject was able to easily recognize the optotype because the state of the optotype presenting means and the state of the correction means are appropriate.

As another example, the determination means may infer that the subject is confused about the answer based on the reaction time, and determine that the test on the subject's eye is not being performed well. More specifically, for example, if the reaction time is longer than a first threshold, it may be inferred that the subject is confused because of a slow answer, and may determine that the optotype is not recognized because at least one of the state of the optotype presenting means and the state of the correction means is inappropriate.

As another example, the determination means may infer that the subject answered correctly by chance based on the reaction time, and determine that the test on the subject's eye was not performed well. More specifically, for example, if the reaction time is shorter than the first threshold, it may be inferred that the subject answered quickly and answered by feel, and it may be determined that the subject was unable to recognize the optotype because at least one of the state of the optotype presenting means and the state of the correction means is inappropriate.

For example, the determination means may determine whether the subject's response is successful or not based on whether the reaction time exceeds a preset second threshold. For example, the first threshold for determining whether the state of the eye examination system is appropriate and the second threshold for determining whether the subject's response is successful or not may be the same or different. For example, when the first threshold and the second threshold are different, the second threshold may be set in a direction that shortens the reaction time relative to the first threshold, or in a direction that lengthens the reaction time relative to the first threshold. Of course, the second threshold may be set both in a direction that shortens the reaction time relative to the first threshold and in a direction that lengthens the reaction time.

For example, the determination means may change the method of determining whether the subject's response is successful or not, based on whether the reaction time exceeds a preset second threshold. As an example, the determination means may determine that the subject's response is successful if the reaction time does not exceed the second threshold. At this time, the determination means may further determine that the subject's response is successful if the subject's response is correct, and may determine that the subject's response is unsuccessful if the subject's response is incorrect. Also, as an example, the determination means may determine that the subject's response is unsuccessful if the reaction time exceeds the second threshold. At this time, the determination means may further determine that the subject's response is unsuccessful regardless of whether the subject's response is correct or incorrect.

<Control Means>
The optometry system in this embodiment includes a control means (e.g., a control unit 70). The control means controls the operation of the optometry system. For example, the control means may control the operation of the optometry system based on a start signal for controlling the operation of the optometry system. In this case, the control means may control the operation of the optometry system based on a start signal automatically input based on an optometry program or the like. In this case, the control means may control the operation of the optometry system based on a start signal input by an examiner operating an operation means (e.g., the controller 6). In this case, the control means may control the operation of the optometry system based on a start signal received by an examiner operating an operation means. Of course, for example, the control means may control the operation of the optometry system based on a start signal (input signal) input by an examinee operating a response input means. In addition, for example, the control means may control the operation of the optometry system based on a start signal (input signal) received by an examinee operating a response input means. For example, the control means may control the operation of the optometry system based on a start signal (input signal) received by an examinee operating a response input means. For example, the examination (optometry) of the examinee's eye may proceed automatically based on these start signals.

For example, the eye examination program may include a self-eye examination application program. The self-eye examination application program is a program for realizing an application (self-eye examination application) that automatically progresses the eye examination based on answers entered by the subject. In this case, the control means may control the operation of the eye examination system by executing the self-eye examination application.

For example, the control means can control at least one of the optotype presenting means and the correction means. As one example, the control means can control the display of the optotype presenting means, and can change at least one of the type of optotype, the visual acuity value of the optotype, etc. As another example, the control means can control the correction optical system, and can change at least one of the correction power for correcting the eye to be examined, the arrangement of the optical elements, etc. Of course, for example, the control means may be capable of controlling means other than the optotype presenting means and the correction means.

For example, the control means may control the operation of the eye examination system based on the reaction time acquired by the reaction time acquisition means. As one example, the control means may change the visual acuity value of the optotype when a predetermined reaction time has elapsed. Also, as another example, the control means may change the correction power when a predetermined reaction time has elapsed. In other words, the control means may automatically switch the eye examination system to the next setting when the predetermined reaction time has elapsed. This optimizes the content of the examination and shortens the examination time.

For example, the control means may control the operation of the eye examination system based on the judgment result of the judgment means as to whether the state of the eye examination system is appropriate. Note that, for example, the control means may control the operation of the eye examination system each time a judgment result indicating whether the state of the eye examination system is appropriate is obtained. Also, for example, the control means may control the operation of the eye examination system when the judgment result indicating whether the state of the eye examination system is appropriate is the same a predetermined number of times in succession.

For example, the control means may change the state of the optotype presenting means (i.e., the state of the visual acuity value of the optotype, etc.) based on whether the state of the eye examination system is appropriate. As an example, the control means may change the number of steps by which the visual acuity value of the optotype is changed based on whether the state of the eye examination system is appropriate. In more detail, the control means may change the visual acuity value of the optotype by two steps when the state of the eye examination system is appropriate, and may change the visual acuity value of the optotype by one step when the state of the eye examination system is inappropriate, etc.

For example, the control means may change the state of the correction means (i.e., the state of the correction power, etc.) based on whether the state of the eye examination system is appropriate. As an example, the control means may change the number of steps for changing the correction power based on whether the state of the eye examination system is appropriate. In more detail, the control means may change the correction power in one step (0.25D) when the state of the eye examination system is appropriate, and may change the correction power in two steps (0.5D) when the state of the eye examination system is inappropriate, etc.

For example, the control means may control the operation of the eye examination system based on the result of the determination by the determination means of whether the subject's response is successful or not. For example, the control means may control the operation of the eye examination system as described above when it is determined that the subject's response is successful. Also, for example, the control means may not necessarily control the operation of the eye examination system when it is determined that the subject's response is unsuccessful. In other words, the control means may control the operation of the eye examination system using the reaction time when the subject's response is successful and excluding the reaction time when the subject's response is determined to be unsuccessful.

<Output means>
The eye examination system in this embodiment includes an output means (e.g., a control unit 70). The output means outputs the reaction time acquired by the reaction time acquisition means. For example, by outputting the reaction time required by the subject from the start of the test to the response, it is possible to estimate the possibility that the subject answered correctly by chance and to judge whether the test result of the subject's eye is accurate or not. In addition, by taking into account the possibility that the subject answered correctly by chance, the settings of the next test can be easily determined.

For example, the output means may output the reaction time to a display means (e.g., a monitor 6a) to display the reaction time on the display means. Also, for example, the output means may output the reaction time to an audio generation means (e.g., a speaker) to generate the reaction time as an audio guide. Also, for example, the output means may output the reaction time to a printing means (e.g., a printer) to print the reaction time. Also, for example, the output means may output the reaction time to a storage means (e.g., a memory, a server, etc.) to store the reaction time.

For example, the output means may output the reaction time in at least one of these output forms. Of course, for example, the output means may output an identifier associated with the reaction time in at least one of these output forms. As an example, the output may be made using a character string, a one-dimensional code, a two-dimensional code, etc.

For example, the output means may output the first reaction time and the second reaction time acquired by the reaction time acquisition means in a comparable manner. As one example, the output means may output the first reaction time and the second reaction time side by side, or may output them in a switchable manner. Also, as one example, the output means may output the first reaction time and the second reaction time over time. This makes it easier to understand the possibility that the subject has answered correctly by chance from a change in the subject's reaction time.

For example, the output means may output information including at least the reaction time. As an example, the output means may output the reaction time itself. In other words, it may output the number of seconds it took the subject to respond from the start of the measurement. As another example, the output means may output the state of the eye examination system acquired by the state acquisition means along with the reaction time. More specifically, along with the reaction time, the output means may output the state of the optotype presenting means (at least one of the states of the type of optotype, the visual acuity value of the optotype, the number of times the type of optotype has been switched, the number of times the visual acuity value of the optotype has been switched, etc.), the state of the correction means (at least one of the states of the correction power of the subject's eye, the number of times the correction power of the subject's eye has been switched, etc.), etc. This makes it easy to determine whether the subject's reaction time has increased or decreased in response to a change in the state of the eye examination system.

For example, the output means may output data that makes it possible to grasp the relationship between the reaction time and the state of the eye examination system. For example, data that continuously shows the change in reaction time accompanying the change in the state of the eye examination system may be output. As one example, at least one of graph data, table data, etc., that continuously shows such changes may be output.

For example, the output means may output the reaction time and the state of the eye examination system as graph data showing the relationship between the reaction time and the state of the eye examination system. As one example, the output means may output graph data showing the relationship between the reaction time and the visual acuity value of the eye target set by the eye target presenting means. As another example, the output means may output graph data showing the relationship between the reaction time and the correction power set by the correction means. This makes it easy to grasp the progress of the subject's reaction time as it changes depending on the state of the eye examination system.

Of course, for example, the output means may output information other than the state of the eye examination system along with the reaction time. For example, at least one of the following information may be output: the subjective value of the subject's eye measured in a subjective test, the test time required for a series of measurements for each test item, etc.

<Guidance Information Output Means>
The eye examination system in this embodiment includes a guidance information output means (e.g., a control unit 70). The guidance information output means outputs guidance information for guiding the subject to input an answer during the examination of the subject's eye based on the reference value set by the setting means. For example, the guidance information output means may output guidance information during the examination based on the amount of deviation of the measurement time from the reference value. This reduces the subject's confusion in the operation during self-eye examination, thereby obtaining accurate examination results. In addition, for example, this allows guidance information to be output at an appropriate timing for each subject, reducing the burden on the subject and allowing the examination to proceed smoothly. That is, taking into account the reaction speed that differs from subject to subject, the subject can be prompted to input an answer at a timing that is neither too early nor too late according to the subject.

For example, the guidance information output means may control a display means (e.g., a display 31) and cause the display means to display the guidance information. Also, for example, the guidance information output means may control a sound generation means (e.g., a speaker) and cause the sound generation means to generate the guidance information as sound. Note that the guidance information output means may execute a combination of these controls, or may execute a different control from these.

For example, the guidance information output means may repeatedly output the guidance information if no signal is obtained from the response input means even after a predetermined time set for repeating the guidance information has elapsed. In this case, the predetermined time may be set to an arbitrary time by the examiner. Also, in this case, the predetermined time may be set to a time previously set based on an experiment, simulation, or the like. Also, in this case, the predetermined time may be a time based on a reference value. As an example, the predetermined time may be the same as the reference value, or may be a time obtained by increasing or decreasing the reference value by a predetermined time.

For example, at this time, the guidance information may be output repeatedly at all times at a predetermined time. In other words, it may be output repeatedly at a fixed time interval. Also, for example, at this time, the guidance information may be output repeatedly at any time. As one example, it may be output repeatedly so that the time interval is gradually shortened or lengthened. As another example, it may be output repeatedly so that the time interval changes depending on the number of times the guidance information is output. This allows the test to proceed easily even if the subject becomes unsure of how to operate the response input means during the test.

When repeating the guidance information, the guidance information output means may change the guidance information from the first guidance information to the second guidance information and output it according to the number of times the guidance information is output. For example, the second guidance information may be information that is at least partially different from the first guidance information. As an example, the first guidance information may be information that represents an operation method for operating the response input means in order for the subject to input an answer regarding visual recognition of the test optotype. As another example, the second guidance information may be information that represents an operation method for the subject to operate the response input means in order to call the examiner. Furthermore, the second guidance information may be information that includes information that represents an operation method for the subject to input an answer and information that represents an operation method for calling the examiner. Of course, the first guidance information and the second guidance information may be information that is different from these.

For example, the number of times the guidance information is output may be a number set arbitrarily by the examiner. Also, for example, the number of times the guidance information is output may be a number set in advance based on an experiment, a simulation, or the like. For example, the guidance information may be switched every predetermined number of outputs. As an example, if the number of outputs is set to two, the first guidance information may be output twice, and then the second guidance information may be output twice. Note that the first guidance information and the second guidance information may be output alternately based on the number of times the guidance information is output. Of course, the guidance information is not limited to the first guidance information and the second guidance information, and may further include third guidance information, fourth guidance information, etc., and each output may be switched.

Note that the present disclosure is not limited to the devices described in the present embodiment. For example, terminal control software (programs) that perform the functions of the following embodiments can be supplied to a system or device via a network or various storage media, and the control device (e.g., a CPU) of the system or device can read and execute the program.

First Example
A first example of an optometry system according to this embodiment will be described.

Figure 1 shows an example of a subjective optometry device 100 included in the optometry system 1. For example, the subjective optometry device 100 (hereinafter, optometry device 100) can subjectively measure the optical characteristics of the subject's eye. For example, the subjective ocular refractive power (i.e., subjective value) of the subject's eye can be measured as the optical characteristics of the subject's eye. For example, the optometry device 100 includes a housing 2, a presentation window 3, a forehead rest 4, a chin rest 5, a controller 6, an imaging unit 90, etc.

The presentation window 3 is used to present the visual target to the subject's eye E. The forehead rest 4 is used to keep the distance between the subject's eye E and the optometry device 100 constant. The chin rest 5 is used to keep the distance between the subject's eye E and the optometry device 100 constant.

The controller 6 includes a monitor 6a, a switch section 6b, etc. The monitor 6a displays various information (e.g., the measurement results of the subject's eye E, etc.). The monitor 6a is a touch panel, and also functions as the switch section 6b. The switch section 6b is used to perform various settings (e.g., input of a start signal, etc.). A signal corresponding to an operation instruction from the controller 6 is output to the control section 70 by wired communication via a cable not shown. Of course, a signal corresponding to an operation instruction from the controller 6 may also be output to the control section 70 by wireless communication via infrared rays, etc.

The imaging unit 90 includes an imaging optical system (not shown). For example, the imaging optical system is used to capture an image of the subject's face. For example, the imaging optical system may be composed of an imaging element and a lens.

<Measurement section>
The measurement unit 7 includes a left eye measurement unit 7L and a right eye measurement unit 7R. In this embodiment, the left eye measurement unit 7L and the right eye measurement unit 7R are configured from the same material. Of course, the left eye measurement unit 7L and the right eye measurement unit 7R may be configured from at least a part of different materials. The measurement unit 7 includes a pair of left and right subjective measurement units, which will be described later, and a pair of left and right objective measurement units, which will be described later. The visual target light beam and the measurement light beam from the measurement unit 7 are guided to the subject's eye E through the presentation window 3.

Figure 2 is a diagram showing the measurement unit 7. In Figure 2, the measurement unit 7 for the left eye 7L is taken as an example of the measurement unit 7. The measurement unit 7R for the right eye is omitted because it has the same configuration as the measurement unit 7L for the left eye. For example, the measurement unit 7L for the left eye includes an objective measurement optical system 10, a subjective measurement optical system 25, a first target projection optical system 45, a second target projection optical system 46, an observation optical system 50, etc.

<Objective Measuring Optical System>
The objective measuring optical system 10 is used as a part of an objective measuring unit that objectively measures the optical characteristics of the subject's eye. In this embodiment, an objective measuring unit that measures the ocular refractive power of the subject's eye E will be described as an example of the optical characteristics of the subject's eye E. Note that the optical characteristics of the subject's eye E may be axial length, corneal shape, etc., in addition to the ocular refractive power. For example, the objective measuring optical system 10 is composed of a projection optical system 10a and a light receiving optical system 10b.

The projection optical system 10a projects a spot-shaped measurement index onto the fundus of the subject's eye E through the center of the pupil of the subject's eye E. For example, the projection optical system 10a includes a light source 11, a relay lens 12, a hole mirror 13, a prism 15, an objective lens 93, a dichroic mirror 35, a dichroic mirror 29, etc.

The light receiving optical system 10b extracts the fundus reflected light beam reflected by the fundus of the test eye E in a ring shape through the pupil periphery of the test eye E. For example, the light receiving optical system 10b includes a dichroic mirror 29, a dichroic mirror 35, an objective lens 93, a prism 15, a hole mirror 13, a relay lens 16, a mirror 17, a light receiving aperture 18, a collimator lens 19, a ring lens 20, an image sensor 22, etc.

In this embodiment, the description of the projection optical system 10a and the light receiving optical system 10b will be omitted. For details of these, please refer to, for example, JP 2018-47049 A.

<Subjective Measuring Optical System>
The subjective measurement optical system 25 is used as a part of the configuration of a subjective measurement unit that subjectively measures the optical characteristics of the subject's eye E. In this embodiment, a subjective measurement unit that measures the ocular refractive power of the subject's eye E is taken as an example of the optical characteristics of the subject's eye E. Note that the optical characteristics of the subject's eye E may be contrast sensitivity, binocular vision function (e.g., amount of heterophoria, stereoscopic vision function, etc.), etc., in addition to ocular refractive power. For example, the subjective measurement optical system 25 is composed of a light projection optical system 30 and a correction optical system 60.

<Light projection optical system>
The light projection optical system 30 projects a visual target light beam toward the subject's eye E. For example, the light projection optical system 30 includes a display 31, a light projection lens 33, a light projection lens 34, a reflecting mirror 36, an objective lens 92, a dichroic mirror 35, a dichroic mirror 29, and the like.

The display 31 displays a visual target (fixation target, test visual target, etc.). The visual target light beam emitted from the display 31 is projected onto the subject's eye E via the optical components from the projection lens 33 to the dichroic mirror 29 in order. The dichroic mirror 35 makes the optical path of the objective measurement optical system 10 and the optical path of the subjective measurement optical system 25 a common optical path. In other words, the dichroic mirror 35 makes the optical axis L1 of the objective measurement optical system 10 and the optical axis L2 of the subjective measurement optical system 25 coaxial. The dichroic mirror 29 is an optical path branching component. The dichroic mirror 29 reflects the visual target light beam from the projection optical system 30 and the measurement light beam from the projection optical system 10a described below, and guides them to the subject's eye E.

<Corrective optical system>
The correction optical system 60 is disposed in the optical path of the light projection optical system 30. The correction optical system 60 changes the optical characteristics of the visual target light beam emitted from the display 31. For example, the correction optical system 60 includes an astigmatism correction optical system 63, a drive mechanism 39 described later, and the like.

The astigmatism correction optical system 63 is used to correct the cylindrical power and astigmatism axis angle of the subject's eye E. The astigmatism correction optical system 63 is disposed between the projector lens 33 and the projector lens 34. The astigmatism correction optical system 63 is composed of two positive cylindrical lenses 61a and 61b with the same focal length. The cylindrical lenses 61a and 61b are each independently rotated around the optical axis L2 by the drive of the rotation mechanisms 62a and 62b.

In this embodiment, the astigmatism correcting optical system 63 is described using cylindrical lenses 61a and 61b as an example, but is not limited to this. The astigmatism correcting optical system 63 may be configured to correct the cylindrical power, astigmatism axis angle, etc. As an example, a corrective lens may be inserted and removed from the optical path of the projection optical system 30.

<Drive unit>
In this embodiment, the light source 11 and relay lens 12 included in the projection optical system 10a, the light receiving diaphragm 18, collimator lens 19, ring lens 20, and image sensor 22 included in the light receiving optical system 10b, and the display 31 included in the light projection optical system 30 can be moved integrally in the optical axis direction by a drive mechanism 39. In other words, the display 31, light source 11, relay lens 12, light receiving diaphragm 18, collimator lens 19, ring lens 20, and image sensor 22 are synchronized as a drive unit 95, and are moved integrally by the drive mechanism 39. The drive mechanism 39 is composed of a motor and a slide mechanism. The position to which the drive mechanism 39 is moved is detected by a potentiometer (not shown).

The drive mechanism 39 moves the drive unit 95 in the optical axis direction to move the display 31 in the optical axis L2 direction. This allows the subject's eye E to be clouded in an objective measurement. In a subjective measurement, the presentation distance of the visual target relative to the subject's eye E can be optically changed to correct the spherical power of the subject's eye E. That is, the configuration that moves the display 31 in the optical axis L2 direction is used as a spherical correction optical system that corrects the spherical power of the subject's eye E, and the spherical power of the subject's eye E is corrected by changing the position of the display 31. Note that the configuration of the spherical correction optical system may be different from that of this embodiment. For example, the spherical power may be corrected by placing a large number of optical elements in the optical path. Also, for example, the spherical power may be corrected by placing a lens in the optical path and moving the lens in the optical axis direction.

The drive mechanism 39 also moves the light source 11, relay lens 12, and the image sensor 22 from the light receiving aperture 18 in the direction of the optical axis L1 by moving the drive unit 95 in the optical axis direction. As a result, the light source 11, the light receiving aperture 18, and the image sensor 22 are arranged so as to be optically conjugate with the fundus of the subject's eye E. Regardless of the movement of the drive unit 95, the hole mirror 13 and the ring lens 20 are arranged so as to be conjugate with the pupil of the subject's eye E at a constant magnification. For this reason, the fundus reflection light beam reflected from the measurement light beam of the projection optical system 10a is always incident on the ring lens 20 of the light receiving optical system 10b as a parallel light beam, and a ring-shaped light beam of the same size as the ring lens 20 is imaged by the image sensor 22 in a focused state, regardless of the ocular refractive power of the subject's eye E.

<First target projection optical system and second target projection optical system>
The first target projection optical system 45 and the second target projection optical system 46 are disposed between the dichroic mirror 29 and a deflection mirror 81 described later. The first target projection optical system 45 emits near-infrared light for projecting an alignment target at infinity onto the cornea of the subject's eye E. The second target projection optical system 46 is disposed at a position different from the first target projection optical system 45, and emits near-infrared light for projecting an alignment target at finite distance onto the cornea of the subject's eye. The near-infrared light (alignment light) emitted from the second target projection optical system 46 is also used as anterior segment imaging light for imaging the anterior segment of the subject's eye by the observation optical system 50.

<Observation optical system>
The observation optical system (imaging optical system) 50 includes a dichroic mirror 29, an objective lens 103, an imaging lens 51, an imaging element 52, etc. The dichroic mirror 29 transmits the anterior segment observation light and the alignment light. The imaging element 52 has an imaging surface arranged at a position conjugate with the anterior segment of the subject's eye E. The output from the imaging element 52 is input to the control unit 70. As a result, an anterior segment image of the subject's eye E is captured by the imaging element 52 and displayed on the monitor 6a. The observation optical system 50 also serves as an optical system for detecting an alignment index image formed on the cornea of the subject's eye E by the first index projecting optical system 45 and the second index projecting optical system 46, and the position of the alignment index image is detected by the control unit 70.

<Internal configuration of the optometry device>
The internal configuration of the optometry device 100 will be described. Fig. 3 is a schematic diagram of the inside of the optometry device 100 as viewed from the front. Fig. 4 is a schematic diagram of the inside of the optometry device 100 as viewed from the side. Fig. 5 is a schematic diagram of the inside of the optometry device 100 as viewed from above. For ease of explanation, Figs. 4 and 5 only show the optical axis of the left eye measurement unit 7L.

The optometry device 100 includes a subjective measurement unit. For example, the subjective measurement unit includes a measurement unit 7, a deflection mirror 81, a driving mechanism 82, a driving unit 83, a reflection mirror 84, a concave mirror 85, and the like. The subjective measurement unit is not limited to this configuration. For example, the configuration may not include the reflection mirror 84. In this case, the visual target light beam from the measurement unit 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. Also, for example, the configuration may include a half mirror. In this case, the visual target light beam from the measurement unit 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 via the half mirror, and the reflected light beam may be guided to the subject's eye E.

The optometry device 100 has a left eye drive unit 9L and a right eye drive unit 9R, and can move the left eye measurement unit 7L and the right eye measurement unit 7R in the X direction. For example, by moving the left eye measurement unit 7L and the right eye measurement unit 7R, the distance between the measurement unit 7 and a deflection mirror 81 described below changes, and the presentation position in the Z direction of the visual target light beam from the measurement unit 7 is changed. As a result, the visual target light beam corrected by the correction optical system 60 is guided to the subject's eye E, and the measurement unit 7 is adjusted in the Z direction so that an image of the visual target light beam corrected by the correction optical system 60 is formed on the fundus of the subject's eye E.

For example, the deflection mirror 81 has a right-eye deflection mirror 81R and a left-eye deflection mirror 81L that are provided in a pair on the left and right sides. For example, the deflection mirror 81 is arranged between the correction optical system 60 and the subject's eye E. That is, the correction optical system 60 in this embodiment has a left-eye corrective optical system and a right-eye corrective optical system that are provided in a pair on the left and right sides, with the left-eye deflection mirror 81L arranged between the left-eye corrective optical system and the left eye EL, and the right-eye deflection mirror 81R arranged between the right-eye corrective optical system and the right eye ER. For example, the deflection mirror 81 is preferably arranged at a pupil conjugate position.

For example, the left eye deflection mirror 81L reflects the light beam projected from the left eye measurement unit 7L and guides it to the left eye EL. Also, for example, the left eye deflection mirror 81L reflects the fundus reflection light beam from the left eye EL and guides it to the left eye measurement unit 7L. For example, the right eye deflection mirror 81R reflects the light beam projected from the right eye measurement unit 7R and guides it to the right eye ER. Also, for example, the right eye deflection mirror 81R reflects the fundus reflection light beam from the right eye ER and guides it to the right eye measurement unit 7R. In this embodiment, a configuration using the deflection mirror 81 as a deflection member that reflects and guides the light beam projected from the measurement unit 7 to the subject eye E is described as an example, but is not limited to this. The deflection member may be, for example, a prism, a lens, etc., as long as it can reflect and guide the light beam projected from the measurement unit 7 to the subject eye E.

For example, the drive mechanism 82 is composed of a motor (drive unit) and the like. For example, the drive mechanism 82 has a drive mechanism 82L for driving the left-eye deflection mirror 81L and a drive mechanism 82R for driving the right-eye deflection mirror 81R. For example, the deflection mirror 81 rotates when driven by the drive mechanism 82. For example, the drive mechanism 82 rotates the deflection mirror 81 about a horizontal rotation axis (X direction) and a vertical rotation axis (Y direction). That is, the drive mechanism 82 rotates the deflection mirror 81 in the XY directions. Note that the rotation of the deflection mirror 81 may be either the horizontal direction or the vertical direction.

For example, the drive unit 83 is composed of a motor or the like. For example, the drive unit 83 has a drive unit 83L for driving the left eye deflection mirror 81L and a drive unit 83R for driving the right eye deflection mirror 81R. For example, the deflection mirror 81 moves in the X direction when driven by the drive unit 83. For example, by moving the left eye deflection mirror 81L and the right eye deflection mirror 81R, the distance between the left eye deflection mirror 81L and the right eye deflection mirror 81R is changed, and the distance in the X direction between the left eye optical path and the right eye optical path can be changed according to the interpupillary distance of the test eye E.

For example, multiple deflection mirrors 81 may be provided in each of the left eye optical path and the right eye optical path. For example, two deflection mirrors may be provided in each of the left eye optical path and the right eye optical path (for example, two deflection mirrors may be provided in the left eye optical path, etc.). In this case, one deflection mirror may be rotated in the X direction, and the other deflection mirror may be rotated in the Y direction. For example, by rotating and moving the deflection mirror 81, the apparent light beam for forming an image of the visual target light beam in front of the subject's eye can be deflected, and the position where the image of the visual target light beam is formed can be optically corrected.

For example, the concave mirror 85 is shared by the left eye measurement unit 7L and the right eye measurement unit 7R. For example, the concave mirror 85 is shared by the left eye optical path including the left eye correction optical system and the right eye optical path including the right eye correction optical system. That is, the concave mirror 85 is arranged at a position where it passes through both the left eye optical path including the left eye correction optical system and the right eye optical path including the right eye correction optical system. Of course, the concave mirror 85 does not have to be configured to be shared by the left eye optical path and the right eye optical path. That is, a concave mirror may be provided in each of the left eye optical path including the left eye correction optical system and the right eye optical path including the right eye correction optical system. For example, the concave mirror 85 guides the visual target light beam that has passed through the correction optical system 60 to the subject's eye E and forms an image of the visual target light beam that has passed through the correction optical system 60 in front of the subject's eye E.

<Optical path of subjective measurement unit>
The optical path of the subjective measurement unit will be described by taking the optical path for the left eye as an example. The optical path for the right eye has the same configuration as the optical path for the left eye. For example, in the subjective measurement unit for the left eye, the visual target light beam emitted from the display 31 in the subjective measurement optical system 25 enters the astigmatism correction optical system 63 through the projection lens 33, and when it passes through the astigmatism correction optical system 63, it is guided from the left eye measurement unit 7L to the left eye deflection mirror 81L via the projection lens 34, the reflection mirror 36, the objective lens 92, the dichroic mirror 35, and the dichroic mirror 29. The visual target light beam reflected by the left eye deflection mirror 81L is reflected by the reflection mirror 84 toward the concave mirror 85. The visual target light beam emitted from the display 31 reaches the left eye EL via each optical member in this way.

As a result, an image of the visual target light beam corrected by the correction optical system 60 is formed on the fundus of the left eye EL, based on the eyeglass wearing position of the left eye EL (for example, about 12 mm from the corneal apex position). Therefore, adjustment of the spherical power by the spherical power correction optical system (in this embodiment, driving the drive mechanism 39) is performed in front of the eye, which is equivalent to placing the astigmatism correction optical system 63 in front of the eye. The subject can collimate the image of the visual target light beam optically formed in front of the eye at a predetermined test distance optically via the concave mirror 85 in a natural state.

<Control Unit>
6 is a diagram showing a control system of the ophthalmological examination apparatus 100. For example, the control unit 70 is electrically connected to various components such as the monitor 6a, the non-volatile memory 75 (hereinafter, memory 75), the light source 11, the image sensor 22, the display 31, and the image sensor 52 provided in the measurement unit 7. In addition, for example, the control unit 70 is electrically connected to drive units (not shown) provided in the drive unit 9, the drive mechanism 39, the drive unit 83, etc.

For example, the control unit 70 includes a CPU (processor), a RAM, a ROM, etc. For example, the CPU controls each component in the optometry device 100. For example, the RAM temporarily stores various information. For example, the ROM stores various programs, optotypes, initial values, etc. for controlling the operation of the optometry device 100. Note that the control unit 70 may be configured with multiple control units (i.e., multiple processors).

For example, the memory 75 is a non-transient storage medium that can retain its stored contents even if the power supply is cut off. For example, a hard disk drive, a flash ROM, a USB memory, etc. can be used as the memory 75. For example, the memory 75 stores a control program for controlling the objective measurement unit and the subjective measurement unit.

<Control operation>
The control operation of the optometric apparatus 100 will be described.

Figure 7 is a diagram showing an example of the flow of subjective testing of the subject's eye E. Here, an example is shown in which the subjective testing is performed using two devices: a first subjective optometry device (optometry device 100) and a second subjective optometry device 200 (hereinafter, optometry device 200). Of course, the subjective testing may be performed using one device, or two or more devices.

First, in a subjective examination (subjective measurement), an assistant A assisting the subject or examiner D performs an examination (measurement) on the subject's eye E using the eye examination device 100. As an example, at least one of the following tests is performed on the subject's eye E: a naked eye visual acuity test, a refractive test, etc. Note that assistant A may be inexperienced in performing tests.

For example, assistant A sets at least one of a predetermined optotype to be presented to the subject's eye E and a predetermined correction power to correct the subject's eye E, and starts the examination. Also, for example, assistant A asks the subject whether he can see the optotype and obtains a response from the subject. For example, the control unit 70 of the optometry device 100 obtains the reaction time required from the start of the examination to obtaining the subject's response. For example, assistant A switches at least one of the optotype and the correction power, taking into account the content and correctness of the subject's response, and starts the examination again to obtain a response from the subject. For example, the control unit 70 obtains the reaction time again. For example, such an operation by assistant A is repeated, and the reaction time of the subject is obtained sequentially. For example, the control unit 70 causes the monitor 6a of the optometry device 100 to display the obtained reaction time.

Next, in the subjective examination, examiner D, who is accustomed to examinations, examines the subject's eye E using an optometric examination device 200, which is different from the optometric examination device 100. For example, examiner D may check the monitor 6a of the optometric examination device 100, judge whether the examination results of the subject's eye E are appropriate based on the subject's reaction time, and perform a re-examination if necessary. As an example, based on the subject's reaction time, only the state in which a specified optotype and a specified correction power are set may be re-examined. This allows the examiner to accurately obtain correct examination results for the subject's eye E. This also allows the examiner to efficiently proceed with the examination of the subject's eye E.

The subject's reaction time may be transmitted from the optometry apparatus 100 to the optometry apparatus 200. For example, the control unit 270 in the optometry apparatus 200 may receive the subject's reaction time and display it on the monitor 26a of the optometry apparatus 200. For example, examiner D may check the monitor 26a of the optometry apparatus 200 to determine whether or not to conduct a re-examination.

The following provides a more detailed explanation using the example of performing a refractive correction test on the subject's eye E.

<Alignment of the test eye and the measurement unit>
First, alignment is performed between the subject's eye E and the measurement unit 7. For example, when the assistant A selects an alignment start switch (not shown) of the switch unit 6b, the control unit 70 moves the measurement unit 7 relative to the subject's eye E. This causes the subject's eye E to coincide (or approximately coincide) with the optical axis L2 in the subjective measurement optical system 25.

<Acquisition of reaction time reference value>
Next, a preliminary measurement of the subject's eye E is started, and a reference value for the subject's reaction time is set. For example, since there are individual differences in the reaction speed of subjects, the timing at which the subject can respond immediately after correctly recognizing the visual target differs. In other words, the reaction time required for the subject to respond immediately after correctly recognizing the visual target varies from subject to subject.

The control unit 70 then controls the display on the monitor 6a to display optotypes that the subject can easily recognize. For example, an optotype that the subject can easily recognize may be one that allows the subject to immediately give a correct answer. In other words, it may be an optotype that the subject can respond to with confidence. The control unit 70 also obtains the reaction time from when the subject recognizes such an optotype to when the subject responds, and sets this as a reference value.

As one example, if the subject has a fast reaction speed and responds one second after the optotype is displayed on the monitor 6a (after the optotype is presented to the subject's eye), the control unit 70 sets the reference value of the subject's reaction time to one second. As another example, if the subject has a slow reaction speed and responds three seconds after the optotype is displayed on the monitor 6a (after the optotype is presented to the subject's eye), the control unit 70 sets the reference value of the subject's reaction time to three seconds. For example, by setting the reference value of the reaction time for each subject in advance, the refractive correction test described below can be performed with high accuracy.

For example, assistant A operates switch unit 6b to select a specific optotype. As an example, assistant A selects the Landolt ring optotype with the lowest visual acuity value. For example, control unit 70 controls display 31 to display the Landolt ring optotype in response to a selection signal from switch unit 6b. Also, for example, control unit 70 stores in memory 75 the timing at which the Landolt ring optotype is displayed on display 31.

For example, assistant A asks the subject which direction the gap in the Landolt ring target is, and when a response is obtained from the subject, operates switch unit 6b to select whether the subject's response is correct or incorrect. When assistant A selects whether the subject's response is correct or incorrect, a response signal that inputs the subject's response is input. Based on the response signal, control unit 70 stores the response timing of the subject in memory 75.

The control unit 70 acquires the reaction time from controlling the display 31 to obtaining a response signal based on the start timing and the response timing. In other words, the reaction time from presenting a visual target to the subject's eye E to obtaining a response is acquired based on the start timing and the response timing. For example, the control unit 70 acquires the difference between the start timing and the response timing as the reaction time. Also, for example, the control unit 70 stores such a reaction time of the subject in the memory 75 as a reference value.

In addition, assistant A may perform the same operation multiple times by changing the direction of the gap of the Landolt ring target presented to the subject's eye E. For example, in this case, the control unit 70 may store the average reaction time of the subject in the memory 75 as a reference value.

<Start of refractive examination>
Next, the measurement of the subjective ocular refractive power (subjective value) of the subject is started. The assistant A operates the switch unit 6b to select a predetermined correction power (first correction power). For example, the assistant A may select the spherical power, the cylindrical power, the astigmatism axis angle, etc., for correcting the eye E based on the objective ocular refractive power (objective value) of the eye E previously acquired. As an example, in this embodiment, the objective values of the eye E are obtained as a spherical power of -3D, a cylindrical power of 0D, and an astigmatism axis angle of 0 degrees, and the assistant A selects the spherical power of -3D, the cylindrical power of 0D, and the astigmatism axis angle of 0 degrees for correcting the eye E based on this. That is, the assistant A selects each value so that the eye E is corrected to 0D.

The control unit 70 controls at least one of the light projection optical system 30 and the correction optical system 60 in response to a selection signal from the switch unit 6b. For example, the control unit 70 may drive the drive mechanism 39 to move the display 31 in the direction of the optical axis L2, thereby correcting the spherical power of the subject's eye E. Also, for example, the control unit 70 may drive the rotation mechanism 62a and the rotation mechanism 62b to rotate the cylindrical lens 61a and the cylindrical lens 61b around the optical axis L2b, thereby correcting at least one of the cylindrical power and the astigmatism axis angle of the subject's eye E. As a result, the subject's eye E is corrected with the first correction power.

Obtaining reaction times during refractive tests
After correcting the eye E to be examined with the first correction power, the assistant A operates the switch unit 6b to select a predetermined optotype. For example, the assistant A may select the visual acuity value of the optotype and the type of the optotype. As an example, in this embodiment, the Landolt ring optotype with a visual acuity value of 1.0 may be selected.

The control unit 70 controls the display 31 to display the Landolt ring on the screen in response to the selection signal from the switch unit 6b. The control unit 70 also stores in the memory 75 the timing at which the Landolt ring is displayed on the display 31 (i.e., the start timing at which the examination of the subject's eye begins).

With the subject's eye E corrected with the first correction power, assistant A asks the subject about the direction of the gap in the Landolt ring target and obtains a response from the subject. After assistant A obtains a response from the subject, assistant A operates switch unit 6b to select whether the subject's response is correct or incorrect. For example, when assistant A selects whether the subject's response is correct or incorrect, a response signal that inputs the subject's response is input. Based on the response signal from switch unit 6b, control unit 70 stores in memory 75 the timing at which the subject's response was selected as correct or incorrect (i.e., the response timing at which the subject responded).

The control unit 70 obtains the reaction time required from the start of the test to obtaining a response from the subject based on the start timing of the test of the subject's eye and the response timing of the subject's response. More specifically, the control unit 70 obtains the reaction time required from the start of the test to obtaining a response from the subject after correcting the subject's eye E with the first correction power (spherical power -3D, cylindrical power 0D, astigmatism axis angle 0 degrees) and starting to present a Landolt ring target with a visual acuity value of 1.0. For example, the control unit 70 obtains the reaction time from the difference between the start timing and the response timing. This obtains the reaction time for the first correction power of the subject's eye E.

In addition, the assistant A may change the orientation of the gap of the Landolt ring target with a visual acuity value of 1.0 presented to the subject's eye E and obtain the subject's response each time. The control unit 70 stores the start timing in the memory 75 each time it controls the display 31 to change the orientation of the first target based on the selection signal from the switch unit 6b (each time the test of the subject's eye is started). In addition, the control unit 70 stores the response timing in the memory 75 each time the subject's response signal is input (each time the subject responds) based on the selection signal from the switch unit 6b. In this way, the control unit 70 can obtain multiple reaction times when correcting the subject's eye E with the first correction power and presenting the Landolt ring target with a visual acuity value of 1.0. For example, the control unit 70 may obtain the average time of these multiple reaction times as the reaction time of the subject's eye E to the first correction power.

For example, assistant A checks whether the first correction power of the eye E is appropriate, and if it is inappropriate, corrects the eye E with a second correction power different from the first correction power. As an example, assistant A may select the spherical power to be -2.75D, the cylindrical power to be 0D, and the astigmatism axis angle to be 0 degrees. That is, assistant A may select each value so that the eye E is corrected with -0.25D. In response to assistant A's selection of the switch unit 6b, the control unit 70 controls at least one of the light projection optical system 30 and the correction optical system 60 to change the first correction power to the second correction power, and stores the start timing at which the second correction power is set in the memory 75. In addition, in response to assistant A's selection of the switch unit 6b, the control unit 70 stores in the memory 75 the response timing at which a response is obtained when the eye E is corrected with the second correction power. For example, the control unit 70 obtains the reaction time for the second correction power of the test eye E based on the difference between the start timing and the response timing. Of course, the average time of multiple reaction times obtained each time the orientation of the gap of the Landolt ring target is changed may be obtained as the reaction time for the second correction power of the test eye E.

For example, during a refractive correction test of the subject's eye E, assistant A switches at least one of the correction power of the subject's eye E and the direction of the gap of the Landolt ring target with a visual acuity value of 1.0 while taking into account the subject's response. For example, the correction power of the subject's eye E that assistant A judges to be appropriate is acquired as the subjective value of the subject's eye E.

For example, during the refractive correction test of the subject's eye E, the control unit 70 sequentially calculates the subject's reaction time based on the start timing of switching the optotype or correction power by controlling any one of the display 31, the light projection optical system 30, and the correction optical system 60, and the response timing of the subject's response to this change. Also, for example, during the refractive correction test of the subject's eye E, the control unit 70 may add up the reaction times of the subject obtained each time the correction power of the subject's eye E and the direction of the gap of the Landolt ring optotype with a visual acuity value of 1.0 are switched, and calculate the reaction time required for each test item.

<Reaction time display>
For example, when the control unit 70 acquires the reaction time of the subject, it displays it on the monitor 6a. For example, when a refraction test is performed on one eye in sequence, the reaction time in the one-eye measurement may be displayed. Also, for example, when a refraction test is performed on both eyes, the reaction time in the binocular measurement may be displayed. Of course, when a refraction test is performed on one eye and both eyes, at least one of the reaction time in the one-eye measurement and the reaction time in the binocular measurement may be displayed.

For example, the control unit 70 may display on the monitor 6a so that reaction times for different start timings during the refraction test can be compared. As an example, a graph (graph 500 described below) showing the reaction time required by the subject for each test item in the refraction test may be generated and displayed on the monitor 6a. As another example, a graph (graph 600 described below) showing the relationship between the subject's reaction time and the correction power used to correct the subject's eye E may be generated and displayed on the monitor 6a. Of course, for example, the control unit 70 may display on the monitor 6a at least one of the test time required for the refraction test, the subjective value of the subject's eye E, the number of times (frequency) the correction power was changed, etc., along with the subject's reaction time.

Figure 8 is an example of the monitor 6a. For example, the monitor 6a displays a result image 80 showing the test results of the subject's eye E, a graph 500 showing the reaction time required for each test item in the refraction test, a graph 600 showing the relationship between the reaction time in the refraction test and the correction power, etc.

For example, in this embodiment, a bar graph is used as the graph 500, but the graph 500 may be at least one of a bar graph, a line graph, an area graph, an approximate curve graph, and the like. Furthermore, in this embodiment, the graph 500 may display the general average reaction time 501 required for each test item.

For example, graph 500 includes spherical test reaction time 502, which is the sum of reaction times obtained each time the spherical power for correcting the subject's eye E is switched during the spherical test of the refractive correction test. Also, for example, graph 500 includes astigmatism test reaction time 503, which is the sum of reaction times obtained each time the cylindrical power or astigmatism axis angle for correcting the subject's eye E is switched during the astigmatism test of the refractive correction test. Note that astigmatism test reaction time 503 may be divided into a reaction time for switching the cylindrical power and a reaction time for switching the astigmatism axis angle.

For example, the examiner can easily ascertain which items took the examinee a long time to respond to by checking the reaction time for each test item on the graph 500. As one example, the examiner may determine whether the subjective value of the test eye E is reliable from the reaction time for each test item. As another example, if the reaction time for a test item is extremely short or extremely long compared to the general average reaction time 501, the examiner may conduct the test again for that test item.

Figure 9 is an example of a graph 600 showing the relationship between reaction time and correction power in a refraction correction test. In this embodiment, a line graph is used as an example of the graph 600, but the graph 600 may be in at least one form of graph, such as a line graph, a bar graph, an area graph, or an approximate curve graph. For example, the vertical axis of the graph 600 is the reaction time of the subject, and the horizontal axis is the correction power (in this embodiment, spherical power) for correcting the subject's eye E.

For example, the graph 600 includes a plurality of points 601 where the subject's reaction time is plotted for each spherical power. In other words, the graph 600 includes a plurality of plot points 601 where the subject's reaction time is plotted each time the spherical power for correcting the subject's eye E is switched. Also, for example, the graph 600 includes a broken line 602 generated based on the plurality of plot points 601. Note that the graph 600 may include either the plurality of plot points 601 or the broken line 602. Also, for example, the graph 600 may include a reference line Std generated based on a reference value of the subject's reaction time.

For example, by checking the subject's reaction time using graph 600, the examiner can infer various information, such as whether the subject responded intuitively, whether the subject easily recognized the visual target, and whether the subject's eye E was in an accommodative state.

As an example, if the subject's eye E can clearly see the Landolt ring and answers confidently, the subject will answer within the specified reaction time. However, if the subject's eye E cannot see the Landolt ring and answers "I don't know" or answers by feel (intuition), the subject's reaction time tends to be the same as the specified reaction time or shorter than the specified reaction time. For this reason, the examiner can infer from the change in plot point 601 the correction power that the subject may have answered by feel (or the range of correction powers that the subject may have answered by feel).

As another example, if the correction power used to correct the subject's eye E is appropriate, the subject's eye E can clearly see the Landolt ring, and the subject's reaction time tends to be short. However, if the correction power used to correct the subject's eye E is inappropriate, the subject's eye E will appear foggy and the Landolt ring will appear blurred, and the subject's reaction time will tend to be long. For this reason, the examiner can infer the appropriate correction power for the subject's eye E from the change in plot point 601.

As another example, when the subject's eye E is accommodating, the subject's eye E can focus on the Landolt ring, which can be clearly seen, and the subject's reaction time tends to be shorter. However, when the subject's eye E is not accommodating (or when the subject's eye E is released), the subject's eye E cannot focus on the Landolt ring, which can be seen as blurry, and the subject's reaction time tends to be longer. For this reason, the examiner can estimate the range ΔS of the corrective power (spherical power) within which the subject's eye E is accommodating, from the change in the plot point 601.

The examiner can compare each plot point 601 with a reference line Std based on the reaction time when a target that the examinee can respond to with confidence is presented, making it easier to determine the possibility that the answer was given by feel, the appropriate correction power, the range ΔS in which accommodation works, etc. For example, the examiner may re-test only the correction power (spherical power) for which the reaction time of the examinee was shorter.

If the subject answers "I don't know" or gives an incorrect answer in the refraction test, this may be displayed on the monitor 6a so that the examiner can understand. For example, the marker (e.g., circle, square, triangle, etc.) of the plot point 601 corresponding to each correction power may be changed depending on the subject's answer. Also, for example, a symbol (e.g., "?", "X", etc.) may be displayed together with the plot point 601 corresponding to each correction power depending on the subject's answer. Of course, if the subject answers correctly, this may also be displayed on the monitor 6a.

In the present embodiment, the assistant operates the switch unit 6b to input the subject's response, but the present invention is not limited to this. For example, the subject may input the response himself. In this case, the optometry device 100 may include a subject controller to be operated by the subject. As an example, the subject controller may have a response lever that can be tilted according to the direction of the gap in the Landolt ring and a button to be pressed when the Landolt ring cannot be recognized. The control unit 70 may store the response timing in the memory 75 based on a response signal input from at least one of the response lever and button.

In this embodiment, the case where a reference value of the subject's reaction time is obtained in a preliminary measurement of the subject's eye E has been described as an example, but this is not limiting. For example, it is not necessary to obtain a reference value of the subject's reaction time. In this case, the appropriate correction power, etc. of the subject's eye E may be estimated using the slope, etc., of the broken line 602.

In addition, in this embodiment, a configuration in which the test eye E is in a naked eye state in the preliminary measurement of the test eye E has been described as an example, but this is not limited to this. For example, the test eye E may be in a corrected state. In this case, the correction power for correcting the test eye E may be selected based on the objective value of the test eye.

Second Example
A second example of the optometry system according to the present embodiment will be described. Here, an example will be given in which the optometry device 100 is configured to be used for self-optometry. In the second example, the same components as those in the first example (e.g., members, optical systems, measurement optical paths, internal configurations, etc.) are denoted by the same reference numerals as those in the first example, and detailed descriptions thereof will be omitted.

Figure 11 shows an example of an optometry device 100. In addition to the configuration of the first embodiment, the optometry device 100 may further include a speaker 99, a subject controller 8, and the like. The speaker 99 outputs audio guidance and the like. The speaker 99 may be configured to have one speaker on each side, or one speaker shared by both sides.

The subject controller 8 is used when the subject inputs the results of interpreting the presented test optotype. The subject controller 8 has an answer lever 8a, an answer button 8b, and the like. For example, the answer lever 8a can be tilted to input signals in four directions, up, down, left, and right, which correspond to the directions of the slits in the Landolt ring optotype. For example, the answer button 8b can be pressed to input a signal indicating that the test optotype cannot be interpreted (is unknown). The signal from the subject controller 8 is output to the control unit 70 by wired or wireless communication.

<Control operation>
The control operation of the optometric apparatus 100 will be described.

In self-eye examination, after alignment between the subject's eye E and the measurement unit 7 is performed, a reference value for the subject's reaction time is set in a preliminary measurement of the subject's eye E. At this time, for example, the control unit 70 may obtain and set the reference value based on the timing when the optotype is displayed on the display 31 and the timing when the subject's controller 8 is operated.

For example, the control unit 70 causes a Landolt ring target that can be easily recognized by the subject to be displayed on the display 31, and stores the timing at which this target is displayed in the memory 75. In addition, an audio guide is generated from the speaker 99 to ask the subject the direction of the slit in the Landolt ring target. For example, the subject determines the direction of the slit in the Landolt ring target and tilts the answer lever 8a in that direction. For example, the control unit 70 causes the memory 75 to store the timing at which the response signal input in conjunction with the tilt of the answer lever 8a is acquired.

The control unit 70 may obtain the difference between these two timings as a reference value. Of course, the control unit 70 may obtain the difference between these two timings multiple times and use the average as the reference value.

Once a reference value for the subject's reaction time is obtained, an objective test and a subjective test are carried out in sequence on the test eye E. For example, an objective value of the test eye E is obtained by the objective test. Also, for example, based on the objective value of the test eye E, the subjective test of the test eye E is started in a state where the test eye E has been corrected to a predetermined ocular refractive power (0 D, etc.) with the first correction power (i.e., a state where the first correction power is used as the initial value). Here, a refractive correction test is started, as in the first embodiment.

Figure 12 is a flowchart showing the detailed flow of a refractive examination. For example, a refractive examination includes multiple test items, and the eye examination for each test item is automatically performed by executing a self-eye examination application. As an example, in this embodiment, a red-green test and a cross cylinder test (steps S1 to S3) for adjusting the first correction power for correcting the test eye E to an appropriate power (second correction power), and a visual acuity test (step S4) for measuring the highest visual acuity value when the test eye E is corrected with the second correction power are performed in sequence.

In a refractive examination of the subject's eye E, particularly in a self-eye examination where the examiner or assistant is not near the subject, a situation may arise where the subject becomes confused during the examination. One example is when the subject becomes unsure of how to operate the subject's controller 8. For this reason, the control unit 70 appropriately outputs guidance information to guide the subject to input an answer based on a reference value for the subject's reaction time. In this embodiment, a voice guide to convey how to operate the subject's controller 8 is generated from the speaker 99 as guidance information. This will be described in more detail later.

<Red-green inspection (S1)>
First, a red-green test is performed to adjust the first spherical power of the first correction power for correcting the eye E. In the red-green test, it is possible to determine whether the state of the eye E corrected with the desired spherical power corresponds to myopia, emmetropia, or hyperopia. For example, if the optotype that can be clearly recognized is red, it is determined to be myopic, if it is green, it is determined to be hyperopic, and if it is about the same, it is determined to be emmetropia. For example, if the eye is hyperopic, it is determined to be overcorrected, and the spherical power is reduced until the eye is in emmetropia (or myopia) state.

At the start of the red-green test, the control unit 70 generates from the speaker 99 an audio guide indicating how to operate the subject controller 8 in the red-green test. As an example, audio guidance may be generated instructing the subject to tilt the answer lever 8a to the left if the optotype that is clearly visible between the red and green optotypes is red, tilt the answer lever 8a to the right if the optotype is green, and press the answer button 8b if the two are about the same.

Next, the control unit 70 proceeds with the test and displays the red-green optotype on the display 31. For example, the red of the red-green optotype is displayed on the left side and the green on the right side. The control unit 70 also generates audio guidance asking the subject which color of the optotype is clearly visible. The subject checks the optotype and either tilts the answer lever 8a to the left or right, or presses the answer button 8b.

When the control unit 70 receives a response signal from the answer lever 8a in response to the subject selecting either a red or green optotype, it increases or decreases the spherical power by one step depending on the tilt direction of the answer lever 8a. In other words, it drives the drive mechanism 39 to move the display 31 in the direction of the optical axis L2. The control unit 70 also generates a voice prompt again asking about the color of the optotype. For example, the control unit 70 repeats this type of control to automatically progress the test.

When the control unit 70 receives a response signal from the answer button 8b indicating that the subject judges the red and green optotypes to be equivalent, the control unit 70 ends the red-green test. The spherical power with which the subject's eye E is corrected at the end of the test is set as the spherical power (second spherical power) at the start of the visual acuity test.

<Cross cylinder inspection (S2)>
Next, a cross cylinder test is performed to adjust at least one of the first astigmatic axis angle and the first cylinder power of the first correction power for correcting the eye E. In the cross cylinder test, it is possible to determine whether the astigmatic axis angle of the eye E coincides with the desired astigmatic axis angle for correcting the eye E. For example, if there is a difference in the appearance of the two point cloud optotypes, it is determined that the angles do not coincide, and if the appearance of the two point cloud optotypes is similar, it is determined that the angles coincide. In addition, in the cross cylinder test, it is possible to determine whether the state in which the eye E is corrected with the desired cylinder power is appropriate. For example, if there is a difference in the appearance of the two point cloud optotypes, it is determined that it is not appropriate, and if the appearance of the two point cloud optotypes is similar, it is determined that it is appropriate.

At the start of the cross cylinder test, the control unit 70 generates audio guidance from the speaker 99, which indicates how to operate the subject controller 8 in the cross cylinder test. As an example, audio guidance may be generated instructing the subject to tilt the answer lever 8a to the left if the left side of the two point cloud targets is clearly visible, tilt the answer lever 8a to the right if the right side is clearly visible, and press the answer button 8b if the two points are about the same.

The control unit 70 advances the test and first adjusts the astigmatism axis angle. The control unit 70 sets the cylindrical lens 61a and the cylindrical lens 61b to an axis angle for adjusting the astigmatism axis angle. The control unit 70 also displays the point cloud optotype on the display 31 and generates a voice guide asking the subject which position of the optotype that can be clearly seen. When the control unit 70 receives a response signal from the answer lever 8a (when the position of the optotype is selected), it changes the astigmatism axis angle according to the tilt direction of the answer lever 8a. That is, it drives the rotation mechanism 62a and the rotation mechanism 62b to rotate the cylindrical lens 61a and the cylindrical lens 61b. The control unit 70 also generates a voice guide again asking about the position of the optotype. For example, the control unit 70 repeats such control until it receives a response signal from the answer button 8b (until it is answered that the visibility of the two optotypes is the same), and automatically advances the test.

When the control unit 70 receives a response signal from the answer button 8b, it switches from adjusting the astigmatism axis angle to adjusting the cylindrical power. The astigmatism axis angle that has corrected the test eye E at this point is set as the astigmatism axis angle at the start of the visual acuity test (the second astigmatism axis angle).

The control unit 70 then adjusts the cylindrical power. The control unit 70 sets the cylindrical lenses 61a and 61b to an axial angle for adjusting the cylindrical power, and generates a voice guide asking about the position of the target. When the control unit 70 receives a response signal from the answer lever 8a, it increases or decreases the cylindrical power by one step depending on the tilt direction of the answer lever 8a, and again generates a voice guide asking about the position of the target. For example, the control unit 70 repeats this type of control until it receives a response signal from the answer button 8b, and automatically progresses the test.

When the control unit 70 receives a response signal from the answer button 8b, it ends the adjustment of the cylindrical power. The cylindrical power corrected for the subject's eye E at this point is set as the cylindrical power at the start of the visual acuity test (second cylindrical power). The control unit 70 also ends the cross cylinder test.

<Red-green inspection (S3)>
The control unit 70 may perform the red-green test again to adjust the second spherical power of the subject's eye E. For example, here, it is confirmed whether or not accommodation by the subject's eye has worked. As an example, the same spherical power is corrected at the end of step S1 and the start of step S3, but if accommodation has worked, the appearance of the red-green optotype changes. Note that the red-green test in step S3 is basically the same as the red-green test in step S1, so a description thereof will be omitted.

The first correction power for correcting the subject's eye E is changed to the second correction power by adjusting the spherical power in the red-green test in step S1 and step S3, and adjusting the astigmatism axis angle and cylindrical power in the cross cylinder test in step S2. That is, the subject's eye E is corrected with the second spherical power, the second astigmatism axis angle, and the second cylindrical power (step S4a in FIG. 13).

<Eye sight test (S4)>
13 shows an example of the flow of a visual acuity test. In a state where the subject's eye E is corrected with the second correction power, a visual acuity test is performed to obtain the highest visual acuity value.

At the start of the visual acuity test, the control unit 70 generates audio guidance from the speaker 99 that indicates how to operate the subject controller 8 in the visual acuity test. As one example, audio guidance may be generated instructing the subject to tilt the answer lever 8a in accordance with the direction of the gap in the Landolt ring, and to press the answer button 8b if the direction of the gap is unknown.

The control unit 70 proceeds with the test and causes the display 31 to display a Landolt ring with a predetermined visual acuity value (step S4b). As an example, a Landolt ring with a visual acuity value of 1.0 is displayed. The control unit 70 also generates audio guidance asking about the direction of the gap in the Landolt ring.

When the control unit 70 receives a response signal from the answer lever 8a, it detects whether the answer by the subject is correct (step S4c). If the answer of the subject is correct, it switches to a Landolt ring with a visual acuity value one level higher (for example, a Landolt ring with a visual acuity value of 1.2) (step S4d), and generates a voice guide again asking about the direction of the gap. If the answer of the subject is incorrect, it switches to a Landolt ring with a visual acuity value one level lower (for example, a Landolt ring with a visual acuity value of 0.9) (step S4e), and generates a voice guide again asking about the direction of the gap. Note that, for example, when a response signal is received from the answer button 8b, the answer of the subject may be regarded as equivalent to an incorrect answer, and the process may proceed to step S4e.

When the control unit 70 proceeds to step S4d, it detects whether the subject's answer is correct (step S4f). If the subject's answer is correct, the process returns to step S4d, and the visual acuity value of the Landolt ring is further increased. If the subject's answer is incorrect, the highest visual acuity value in a state in which the subject's eye E is corrected with the second correction power is obtained (step S4h). For example, in this case, the visual acuity value obtained is not the visual acuity value of the Landolt ring presented to the subject's eye E (the Landolt ring for which the incorrect answer was given), but the visual acuity value of the Landolt ring presented in the previous state and for which the correct answer was given.

When the control unit 70 proceeds to step S4e, it detects whether the subject's answer is correct (step S4g). If the subject's answer is incorrect, the process returns to step S4e, and the visual acuity value of the Landolt ring is further lowered. If the subject's answer is correct, the highest visual acuity value is obtained when the subject's eye E is corrected with the second correction power (step S4h). For example, in this case, the visual acuity value of the Landolt ring presented to the subject's eye E (the Landolt ring for which the correct answer was given) is obtained as the highest visual acuity value.

In addition, in the refractive correction test, a value other than the best visual acuity value of the test eye may be obtained. For example, the most positive correction power value (i.e., the perfect correction value) that provides the best visual acuity of the test eye E may be obtained.

<Output of guidance information>
In addition, while the process of each test item in the refraction test progresses, the subject may forget how to operate the subject controller 8. For example, in a red-green test, after a state in which either a red or green optotype is selected continues, the subject may not know what to do when the appearance of each optotype becomes similar. Similarly, in a cross cylinder test or a visual acuity test, the subject may not know what to do when the appearance of the optotype changes. Since the operation method of the subject controller 8 differs for each of the multiple test items, the subject may be confused. For example, if the subject operates the answer lever 8a or the like in an arbitrary manner, the test automatically progresses, which may affect the test result or cause the test to be reworked, which may take time.

The control unit 70 therefore measures the time from the start timing to the response timing each time the self-eye examination is performed. In other words, the reaction time of the subject is acquired sequentially. For example, the start timing is the timing when the optotype is displayed, or when the correction power (at least one of the spherical power, cylindrical power, and astigmatism axis angle) is changed. For example, the response timing is the timing when a response signal is obtained by operating the subject controller 8.

Furthermore, if no response signal is obtained after a predetermined time based on the reference value of the subject's reaction time has elapsed from these start timings, the control unit 70 assumes that the subject is in difficulty and generates audio guidance showing how to operate the subject controller 8. Such a predetermined time may be a time that does not place a burden on the subject. For example, it may be the same time as the reference value, or it may be a time that exceeds the reference value. The time that exceeds the reference value may be set in advance based on experiments, simulations, etc. As an example, it may be the time when 3 seconds have elapsed in addition to the reference value, etc.

The following describes the details of outputting the guidance information, taking the red-green test in steps S1 and S3 as an example. Here, we will explain the case where the predetermined time based on the reference value of the subject's reaction time is set to the same time as the reference value.

The control unit 70 stores the start timing at which the red-green target is displayed in the memory 75 and starts measuring time. Alternatively, the control unit 70 stores the start timing at which a different spherical power is set (the spherical power is changed) in the memory 75 while the red-green target is still displayed, and starts measuring time. If the control unit 70 receives a response signal from the answer button 8b before the time equal to the reference value has elapsed (if there is a response timing), it ends measuring time. If the control unit 70 does not receive a response signal from the answer button 8b even after the time equal to the reference value has elapsed, it generates a voice guide (first voice guide) that shows how to operate the subject controller 8. When the control unit 70 receives a response signal by the subject inputting an answer according to the voice guide, it automatically progresses the test by changing the spherical power, for example. For example, when a response signal is received while the voice guide is being generated, the generation of the voice guide may be interrupted and the spherical power may be changed.

The control unit 70 may generate an audio guide (second audio guide) again if no response signal is obtained from the subject controller 8 even after a certain time has elapsed since the generation of the first audio guide. For example, in this case, the time may be further measured based on the timing at which the first audio guide was generated, and the second audio guide may be generated when a time equal to the reference value has elapsed since the generation of the first audio guide. Of course, the time is not limited to the reference value, and may be when a time equal to or greater than a reference value has elapsed, when a preset time (e.g., 5 seconds) has elapsed, etc.

For example, the control to repeatedly generate such voice guidance may be performed until a response signal is obtained from the subject controller 8. Alternatively, if no response signal is obtained from the subject controller 8, the control may be performed until a preset number of times is reached. In this case, the test may be forcibly interrupted. The control unit 70 may always keep the time interval for repeating the voice guidance the same, or may change it to become gradually shorter or longer.

The control unit 70 may also change the content of the voice guide depending on the number of times the voice guide is generated. For example, the first voice guide and the second voice guide may have different content. For example, the first voice guide may generate a voice guide that associates the operation method of the subject controller 8 with the subject's view of the optotype, as described above. Also, for example, the second voice guide may generate a voice guide that associates the operation method of the subject controller 8 with a call to the examiner. As an example, a voice guide may be generated instructing the user to press and hold the answer button 8b to call the examiner.

For example, the contents of the first voice guide and the contents of the second voice guide may be generated alternately. Also, for example, the contents of the first voice guide may be repeated a predetermined number of times, and then the contents of the second voice guide may be generated. In other words, the contents of the first voice guide may be switched to the contents of the second voice guide midway through. This allows the subject to proceed with the examination without being confused about how to operate the subject controller 8.

Of course, this is not limited to the red-green test, but also applies to cross cylinder tests and visual acuity tests, and the time from the start timing may be measured in a similar manner, and audio guidance may be generated based on a reference value. When multiple tests are performed on the subject's eye, a reference value for the subject's reaction time may be set for each test item. This allows audio guidance to be generated at the appropriate timing for each test item.

In this case, a standard reaction time value for each test item may be set based on the results of a preliminary measurement of the subject's eye E. For example, in the preliminary measurement, the reaction time from when the subject recognizes an easily recognizable optotype to when he or she responds may be obtained, and a predetermined time that differs for each test item may be added to this reaction time to set the standard reaction time value for each test item. As an example, the predetermined time that differs for each test item may be a time that takes into consideration the number of optotypes that the subject must grasp for each test item (for example, the number of Landolt rings displayed simultaneously).

In addition, for example, in a preliminary measurement, the red-green optotype, cross cylinder optotype, Landolt ring optotype, etc. used in each test item may be displayed in sequence, and the reaction time from when the subject recognizes such optotype to when he or she responds may be set as the reference value of the reaction time for each test item. In other words, the reference value for each test item may be obtained by conducting each simple test in advance.

In this embodiment, the reaction time obtained in the preliminary measurement of the test eye is set as the reference value, but the present invention is not limited to this. For example, during a refraction test, the start timing may be set each time the optotype or correction power is switched, and the response timing may be set each time a response signal is obtained from the answer button 8b, and the reaction time obtained appropriately may be reflected in the reference value. In other words, the reference value of the reaction time may be updated in real time in response to changes in the subject's reaction speed as the refraction test progresses. This optimizes the reference value of the subject's reaction time.

In this case, for example, the control unit 70 may sequentially acquire reaction times during the refractive correction test and reflect the average time of a predetermined number of times in the reference value. For example, the predetermined number of times may be set in advance from an experiment or a simulation. As an example, it may be the average time of five times. For example, the reaction speed of a subject tends to become faster as the subject becomes accustomed to the test. In addition, for example, the reaction speed of a subject tends to become slower if the test is prolonged or if the correction power for the subject's eye is inappropriate. By updating the reference value for the subject's reaction time, it is possible to generate audio guidance to guide the subject to input an answer at a timing that does not place a burden on the subject.

As explained above, for example, the eye examination system in this embodiment acquires and outputs the reaction time required from the start of the examination to a response based on the start timing when the examination (measurement) of the subject's eye is started, which is the start timing when the optotype presenting means or the correction means is controlled, and the response timing after the start timing, which is the response timing when a response signal to the examination is input by the response input means. Therefore, the examiner can determine whether the examination result of the subject's eye is accurate or not from the subject's reaction time. In addition, the examiner can easily determine the next settings, etc., from the subject's reaction time.

For example, the eye examination system in this embodiment obtains reaction times at least at two different times and outputs them in a comparable manner. This makes it easier for the examiner to compare the reaction times of the subjects and judge whether the examination results of the subjects' eyes are appropriate. It also makes it easier for the examiner to decide what action to take next.

In addition, for example, the optometry system in this embodiment obtains at least two reaction times with different start timings and outputs them in a comparable manner. For example, this makes it easier for the examiner to grasp changes in the subject's reaction time.

In addition, for example, the optometry system in this embodiment outputs the state of the optometry system along with the subject's reaction time. This allows the examiner to easily determine whether the subject's reaction time has increased or decreased in response to a change in the state of the optometry system.

In addition, for example, the optometry system in this embodiment outputs graph data showing the relationship between the subject's reaction time and the optometry system. For example, it is possible to output graph data showing the relationship between the subject's reaction time and the correction power set by the correction means. For example, this allows the examiner to easily grasp the progress of changes in the subject's reaction time depending on the state of the optometry system.

For example, the eye examination system in this embodiment sets a reference value based on the subject's reaction time to the test target, and outputs guidance information to guide the subject to input an answer based on this reference value during the test of the subject's eye. This reduces the subject's confusion in the operation during self-eye examination, and allows for accurate test results to be obtained. For example, the progress of the test due to the subject randomly operating the answer lever, etc. is suppressed, so that such random answers are less likely to be reflected in the test results. In addition, the test is less likely to require rework, and the test is performed efficiently. In addition, the eye examination system can set different reference values for each subject, thereby reducing the burden on the subject and allowing the test to proceed smoothly. For example, it can prevent the subject from trying to input an answer, but being determined not to know how to operate the answer lever and outputting guidance information. This allows the subject to input answers at his or her own pace, and the test can be performed comfortably without being rushed or made to wait.

For example, the eye examination system in this embodiment repeatedly outputs guidance information if a signal is not obtained from the subject reading and responding to the test optotypes even after a predetermined time set for repeating the guidance information has elapsed. This allows the subject to easily continue with the test, for example, even if he or she becomes unsure of how to operate an answer lever or the like during the test.

In addition, for example, the eye examination system in this embodiment changes and outputs the guidance information depending on the number of times the guidance information is output. For example, the first guidance information is changed to second guidance information that is at least partially different from the first guidance information, and then output. This can reduce the burden on the subject due to the repeated guidance information.

In addition, for example, the eye examination system in this embodiment sets a reference value based on the subject's reaction time according to multiple test items. This makes it possible to output guidance information at an appropriate timing for each test item, and even if the subject is unsure of how to respond, the possibility of them responding inappropriately is reduced.

For example, the eye examination system in this embodiment obtains the reaction time of the subject based on the start timing when the measurement of the subject's eye is started and the response timing when the subject responds to the test target. This makes it possible to set a standard reaction time value for each subject, taking into account the different reaction speeds of each subject.

In addition, for example, the eye examination system in this embodiment changes and sets the reference value by acquiring the reaction time in real time during the examination. For example, the reference value is changed and set from a first reference value to a second reference value different from the first reference value. This causes the reference value based on the reaction time of the subject to be changed each time according to changes in the subject's reaction speed, and guidance information is output at an appropriate timing. This reduces the burden on the subject. It also leads to a reduction in the examination time.

<Example of transformation>
In this embodiment, the configuration for acquiring the reference value of the reaction time of the subject by performing a preliminary measurement on the subject's eye E has been described as an example, but the present invention is not limited thereto. For example, the reference value of the reaction time of the subject may be set in advance according to age, etc. For example, in this case, the examiner may operate the switch unit 6b to input the subject information. As an example, the subject information may be an ID given to each subject, and may be an ID associated with a name, age, etc. For example, the control unit 70 may set a reference value according to the subject's age by reading the age of the subject associated with such an ID. Of course, the examiner may operate the switch unit 6b to directly input the age of the subject, thereby setting a reference value for each subject. Also, the examiner may operate the switch unit 6b to select an arbitrary reference value from a list, thereby setting a reference value for each subject.

In the present embodiment, a configuration has been described in which the correction power for correcting the subject eye E is gradually changed during a refractive correction test on the subject eye E, but the present invention is not limited to this. For example, a configuration may be used in which the correction power is changed from a predetermined correction power to a desired correction power each time during a refractive correction test on the subject eye E. In this case, the control means in the eye examination system changes the control state of the correction means from the initial state to the first correction state, and returns it to the initial state after the response in the first correction state is completed. Thereafter, the control means changes the control state of the correction means from the initial state to a second correction state different from the first correction state. In other words, when changing the correction state by the correction means, the control means changes the correction state to the initial state once, and then changes the correction state to the next correction state.

For example, the initial state (initial value) of the correction power for correcting the subject's eye E may be set based on the subject's objective value. For example, a correction power at which the subject's eye E is not accommodative (for example, a value of +2.0 D from the objective value) predicted from the subject's objective value may be set. Of course, any value may be set. Also, for example, when the correction power of the subject's eye E is set to an initial value, the reaction time when the correction power of the subject's eye E is switched at a predetermined step (for example, at 0.25 D intervals) is sequentially obtained. At this time, when the correction power of the subject's eye E is switched to the next step, the correction power is returned to the initial value each time.

As an example, if the objective value of the test eye E is -2.0D, the initial value of the correction power is set to 0D. The control unit 70 switches the correction power of the test eye E from 0D to -0.25D, and obtains the reaction time from correcting the test eye E at -0.25D to obtaining a response. Next, the control unit 70 returns the correction power of the test eye E from -0.25D to 0D, and then switches the correction power of the test eye E from 0D to -0.5D, and similarly obtains the reaction time when the test eye E is corrected at -0.5D. Next, the control unit 70 returns the correction power of the test eye E from -0.5D to 0D, and then switches the correction power of the test eye E from 0D to -0.75D, and similarly obtains the reaction time when the test eye E is corrected at -0.75D.

This switching of correction power may be repeated until at least the objective value (-2.0 D) is reached. For example, if the switching of correction power is repeated even after the objective value is exceeded, the repetition may be terminated when no change in reaction time is observed. Of course, even when a refractive correction test is performed in this manner, if no response is input from the subject, audio guidance may be generated as appropriate to guide the subject.

For example, the control unit 70 may create and display graph data based on each reaction time obtained by repeatedly switching the correction power of the test eye E. This makes it possible to grasp, for example, the progress of reaction time, which reflects the time required for the test eye E to adjust. As an example, at the correction power at which the test eye E is able to accommodate, the change in the plot points becomes small (or there is almost no change), and therefore the correct ocular refractive power of the test eye E can be estimated.

In this embodiment, a configuration has been described in which the reaction times at all different start timings obtained during the refractive test for the subject eye E are displayed as comparative graph data, but this is not limiting. In this embodiment, it is sufficient to display the reaction times at at least two different start timings obtained during the refractive test in a comparative manner. For example, in this case, the configuration may be such that assistant A or examiner D can select multiple correction powers of their choice, and the control unit 70 may display the corresponding reaction times in response to a selection signal. Also, for example, in this case, the reaction times at the arbitrary correction powers may be displayed together with the aforementioned graph data.

In this embodiment, a configuration for performing a refractive correction test on the subject's eye E has been described as an example, but the present invention is not limited to this. Of course, in this embodiment, at least one of the following tests may be performed on the subject's eye E: a naked eye visual acuity test, a red-green test, a cross cylinder test, etc. In these cases, the control unit 70 can also determine the subject's reaction time based on the start timing at which the optotype or correction power is switched by controlling any of the display 31, the light projection optical system 30, and the correction optical system 60, and the response timing at which the subject responds to this change.

As an example, in a naked eye visual acuity test of the subject's eye E, the visual acuity value of the optotype presented to the subject's eye E is switched, taking into consideration whether the response of the subject's eye E is correct or incorrect. For this reason, the control unit 70 may store the timing (start timing) at which the display 31 is controlled to switch the visual acuity value of the optotype, and the response timing at which the subject's response is obtained.

Figure 10 is an example of a graph 700 showing the relationship between reaction time and visual acuity value in a naked eye visual acuity test. For example, the vertical axis of the graph 700 is the reaction time of the subject, and the horizontal axis is the visual acuity value of the optotype presented to the subject's eye E. For example, the graph 700 may include a plurality of plot points 701 in which the reaction time of the subject is plotted for each visual acuity value, a broken line 702 generated based on the plurality of plot points 701, a reference line Std generated based on a reference value of the subject's reaction time, and the like. For example, when performing a naked eye visual acuity test on the subject's eye E, the visual acuity value of the presented optotype is usually changed by one step at a time. However, the examiner may change the visual acuity value for which the subject's reaction time has become shorter by two steps based on the progress of the plot points 701.

In addition, in the red-green test of the subject's eye E, the spherical power for correcting the subject's eye E is switched, taking into consideration the correctness of the response of the subject's eye E. For this reason, the control unit 70 may store the timing (start timing) at which the spherical power is switched by controlling the projection optical system 30, and the response timing at which the subject's response is obtained. The control unit 70 may also generate a graph with the subject's reaction time on the vertical axis and the spherical power for correcting the subject's eye E on the horizontal axis.

In addition, in the cross cylinder test of the subject's eye E, the astigmatism axis angle for correcting the subject's eye E is switched, taking into consideration the accuracy of the response of the subject's eye E. For this reason, the control unit 70 may store the timing (start timing) at which the correction optical system 60 is controlled to switch the astigmatism axis power, and the response timing at which the subject's response is obtained. The control unit 70 may also generate a graph with the subject's reaction time on the vertical axis and the astigmatism axis angle for correcting the subject's eye E on the horizontal axis.

In this embodiment, the spherical power for correcting the subject's eye E is switched in the refractive correction test for the subject's eye E, and a graph 600 showing the relationship between the subject's reaction time and the spherical power is displayed. However, the present invention is not limited to this. For example, the cylindrical power of the subject's eye E may be switched in the refractive correction test for the subject's eye E, and a graph showing the relationship between the subject's reaction time and the cylindrical power may be displayed. In addition, for example, the astigmatism axis angle of the subject's eye E may be switched in the refractive correction test for the subject's eye E, and a graph showing the relationship between the subject's reaction time and the astigmatism axis angle may be displayed. When all of the spherical power, cylindrical power, and astigmatism axis angle for correcting the subject's eye E are switched, each graph may be generated and displayed.

In this embodiment, a configuration has been described in which the visual acuity value of the optotype presented to the subject's eye E is not changed during the refractive correction test for the subject's eye E, and only the correction power for correcting the subject's eye E is changed; however, the present invention is not limited to this. Of course, both the visual acuity value of the optotype presented to the subject's eye E and the correction power for correcting the subject's eye E may be changed during the refractive correction test for the subject's eye E. In this case, a graph showing the relationship between the subject's reaction time and the visual acuity value, and a graph showing the relationship between the subject's reaction time and each correction power may be generated. In this case, a graph showing the relationship between the subject's reaction time, the visual acuity value, and each correction power in three dimensions may be generated.

In the present embodiment, the examiner determines the next action based on the reaction time of the subject's eye E, but the present embodiment is not limited to this. For example, the control unit 70 may automatically determine the next action based on the reaction time of the subject's eye E. For example, the control unit 70 may set a predetermined tolerance range for the reference value of the subject's reaction time, and change the visual acuity value of the optotype to be switched next based on whether the subject's reaction time exceeds the tolerance range. More specifically, if the subject's reaction time is similar to the reference value (i.e., within the tolerance range), the visual acuity value of the optotype may be switched to one level higher. Also, if the subject's reaction time is significantly different from the reference value (i.e., outside the tolerance range), the visual acuity value of the optotype may be switched to two levels higher.

For example, the control unit 70 may set a predetermined tolerance range for the reference value of the subject's reaction time, and change the next correction power to be switched based on whether the subject's reaction time exceeds the tolerance range. More specifically, if the subject's reaction time is similar to the reference value (i.e., within the tolerance range), the correction power may be switched in small steps (for example, at 0.25D intervals). If the subject's reaction time is significantly different from the reference value (i.e., outside the tolerance range), the correction power may be switched in large steps (for example, at 0.5D intervals).

For example, in this way, the optometry system in this embodiment can control the operation of the optometry system based on the reaction time of the subject. The optometry system can also use the reaction time of the subject to determine whether the state of the optometry system is appropriate, and control the operation of the optometry system based on the result. This allows the visual acuity value of the optotype to be presented next to the subject's eye and the correction power to be used to correct the subject's eye to be appropriately selected, optimizing the content of the examination and shortening the examination time.

In this embodiment, the configuration in which the reaction time of the subject is displayed on the monitor 6a has been described as an example, but the present invention is not limited to this. In this embodiment, in addition to the reaction time of the subject, information obtained based on the reaction time of the subject may be displayed on the monitor 6a. As an example, when there is a predetermined difference between the reaction times of the left and right eyes when corrected with each correction power, the predetermined difference may be displayed, or a message informing the user of the presence of the predetermined difference may be displayed. The predetermined difference may be set in advance based on experiments, simulations, etc. For example, with such a configuration, the examiner can easily guess the cause of the large difference in reaction time between the left and right eyes (possibility of disease in the test eye E, possibility of mismatch in the correction power for correcting the left and right eyes, etc.).

7 Measurement unit 10 Objective measurement optical system 25 Subjective measurement optical system 70 Control unit 75 Memory 81 Deflection mirror 84 Reflection mirror 85 Concave mirror 100 Subjective eye examination device

Claims (6)

An eye examination system for presenting a test target to an eye to be examined and subjectively measuring optical characteristics of the eye to be examined, comprising:
a setting means for setting a reference value based on a reaction time of a subject to the test target;
A response input means for inputting a response to the subject's interpretation of the test optotype;
A control means for automatically proceeding with the test based on an input signal from the response input means;
a guidance information output means for outputting guidance information for guiding the subject to input the answer during the examination of the subject's eye based on the reference value set by the setting means;
Equipped with
The optometry system is characterized in that the guidance information output means repeatedly outputs the guidance information when no signal is obtained from the response input means even after a predetermined time set for repeating the guidance information has elapsed. The optometric system of claim 1,
The eye examination system is characterized in that the guidance information output means changes the guidance information from first guidance information to second guidance information that is at least partially different from the first guidance information depending on the number of times the guidance information is output, and outputs the second guidance information. In the optometry system according to claim 1 or 2,
The eye examination includes a plurality of test items,
The eye examination system is characterized in that the setting means sets the reference value according to the examination item. In the optometry system according to any one of claims 1 to 3,
a reaction time acquisition means for acquiring the reaction time based on a start timing at which measurement of the subject's eye is started and a response timing at which the subject responds to the test target,
The eye examination system according to claim 1, wherein the setting means sets the reference value based on the reaction time acquired by the reaction time acquisition means. An optometry program for use in an optometry system for presenting a test target to an eye to be examined and subjectively measuring optical characteristics of the eye to be examined, comprising:
The optometry program is executed by a processor,
A setting step of setting a reference value based on a reaction time of the subject to the test optotype;
A response input step in which the subject inputs a response to the reading of the test optotype;
a control step of automatically proceeding with the inspection based on the input signal from the response input step;
a guidance information output step of outputting guidance information for guiding the subject to input the answer during the examination of the subject's eye, based on the reference value set in the setting step;
executes the above-mentioned optometric system;
The optometry program is characterized in that the guidance information output step repeatedly outputs the guidance information when a signal from the response input step is not obtained even after a predetermined time set for repeating the guidance information has elapsed. The optometry program according to claim 5,
The optometry program, characterized in that the guidance information output step changes the guidance information from first guidance information to second guidance information that is at least partially different from the first guidance information and outputs the second guidance information depending on the number of times the guidance information is output.