CN114468979B

CN114468979B - Diopter measuring device and portable refractometer thereof

Info

Publication number: CN114468979B
Application number: CN202111670472.4A
Authority: CN
Inventors: 王清扬; 杨翁泽川; 杨志秋
Original assignee: Reyemico Hangzhou Medical Technology Inc
Current assignee: Reyemico Hangzhou Medical Technology Inc
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2025-07-25
Anticipated expiration: 2041-12-31
Also published as: CN114468979A

Abstract

The present disclosure provides a refractive measurement device, which includes: a detection light source, which emits detection light; a light source lens group, which emits the detection light into the eye to be measured; an imaging lens group, which includes an annular light spot forming unit; a light spot image extraction mechanism, which collects the annular light spot image formed by the imaging lens group; a control module, which receives the annular light spot image information obtained by the light spot image extraction mechanism and determines the refractive detection result. Further, the present disclosure provides a portable ophthalmometer. The refractive measurement device and portable ophthalmometer disclosed in the present disclosure can realize objective optometry, have a compact structure, and are convenient for refractive screening.

Description

Diopter measuring device and portable refractometer thereof

Technical Field

The present disclosure relates to ophthalmic optical applications, and more particularly, to a refractive measuring device, and a portable refractometer employing such a refractive measuring device, and in particular, an objective portable refractometer.

Background

The myopia state in China is severe. According to statistics, the total myopia rate of children and teenagers in China in 2020 is 52.7%, wherein the total myopia rate of children and teenagers in 2020 is 14.3%, the total myopia rate of pupil and junior middle school students is 35.6%, the total myopia rate of junior middle school students is 71.1%, and the total myopia rate of junior middle school students is 80.5%. Myopia prevention and control not only reduces short-distance eye time, increases outdoor activity time and grasps correct eye habit and posture, but also has important work of finding Qu Guangbu good as early as possible and interfering with the eye habit and posture, so that regular Qu Guangshai investigation is very important in school age population. Therefore, the handheld optometry instrument with compact structure and convenient use is the best choice for rapidly screening refractive errors of a large number of people.

There are various solutions in the prior art.

Patent document 1

Application number CN201310563823.0, publication number CN103654708B, applicant's shenzhen ston technologies inc. The patent provides a handheld vision testing device which comprises an imaging lens group and an eye chart, wherein the imaging lens group consists of at least one imaging lens, a cornea of a tested human eye is positioned at a focus on one side of the imaging lens group, the device further comprises a sleeve arranged in the middle of one end of the sleeve and an adjusting knob sleeved on the sleeve, an indication line is marked on the outer circumference of the sleeve, the eye chart is arranged on the inner side of the sleeve and is far away from or close to the imaging lens group along with the sleeve when the adjusting knob is rotated, a scale value with diopter of 0 is marked on the outer circumference of the adjusting knob, or the scale value with diopter of 0 is marked on the outer circumference of the sleeve along the axis direction of the sleeve, and the eye chart is just positioned at the focus on the other side of the imaging lens group when diopter of 0 is obtained.

The detection process provided in patent CN103654708 a relies too much on the judgment of the testee to cooperate, which is unfavorable for the examination of the young children and takes a long time.

Patent document 2

Application number 20211067463. X, publication number CN113413130A, the name of the invention "a small-sized optometry and vision tester for short main light path", it discloses a small-sized optometry and vision tester for short main light path, it is a small-sized optometry device related to subjective and objective inspection. The instrument comprises a main light path and three branch light paths, wherein the main light path is sequentially provided with a first spectroscope, a first convex lens, a second spectroscope, a third spectroscope and a wavefront sensor, the first spectroscope, the third convex lens, a pupil imaging camera and the first convex lens are fixed on a shell of a contact eye according to a light path structure, and the second convex lens, the second spectroscope, the fourth convex lens, a light source, the third spectroscope, the wavefront sensor, the fifth convex lens and a sighting target display device are fixed on a movable shell according to the light path structure.

The technical scheme provides a handheld optometry scheme, which comprises objective optometry and subjective optometry, is complex to use, and is unfavorable for wide-range refraction screening.

Patent document 3

Patent grant publication number CN101718542B entitled "an optical ranging device and portable optometry device", filed as shenzhen ston technology limited. The patent provides an optical ranging device based on SHACK-HARTMANN wavefront measurement principle, which comprises a light source for emitting detection light, a light source lens group for injecting the detection light into an eyeball (109) to be measured, a measurement arm lens group for amplifying the wavefront change of the detection light reflected back by the cornea of the eyeball (109) to be measured, an array optical element for measuring the amplified wavefront change, and a processing unit comprising a photoelectric conversion module for analyzing the light passing through the array optical element to obtain the distance between the corresponding eyeball (109) to be measured and the measurement arm lens group. Compared with the prior art, the portable optometry instrument has the advantages that the distance between the portable optometry instrument and the eyeball to be measured can be accurately determined, and the detection precision is further improved.

With respect to Hartmann-Shack wavefront sensors, which are one of the primary applications of microlenses, microlens arrays are typically placed in a specific position in front of a CCD array such that a planar wavefront imaged on the CCD sensor will form a regular pattern of bright spots. If the light imaged on the CCD sensor is to consist of a spot containing a certain separation of off-spot and vanishing spot, it is indicated that the wavefront is distorted. This information can be used to calculate the shape of the wavefront incident on the microlens array. Hartmann-shack wavefront sensors may be used to characterize the performance of an optical system and also to control adaptive optics by monitoring the wavefront in real time to achieve the purpose of eliminating wavefront distortion prior to imaging.

The contents of all cited publications are incorporated by reference into this disclosure.

Disclosure of Invention

[ Problem to be solved ]

The present disclosure is directed to a refractive measurement device and portable refractometer that is more suitable for extended refractive screening in school-age people. Compared with the prior art, the technical scheme has the advantages that aiming at the application characteristics, the product structure is simplified on the premise of meeting the use requirements, so that the instrument is small and compact, and the cost is reduced. And the objective measurement mode is adopted, so that subjective response of a person to be measured in the measurement is reduced to the maximum extent.

Technical scheme

In order to solve one of the technical problems described above, a first aspect of the present disclosure provides a refraction measuring device, which includes a detection light source that emits detection light, a light source lens group that emits the detection light into an eye to be measured, an imaging lens group that includes an annular light spot forming unit, a light spot image extracting mechanism that collects an annular light spot image formed by the imaging lens group, and a control module that receives the annular light spot image information obtained by the light spot image extracting mechanism and determines a refraction detection result.

The control module is provided with a data processing unit, wherein an algorithm program is preset in the control module. The extracted annular spot images are fitted to a corresponding annular shape, typically the annular shape obtained is elliptical. Whereby the control module determines an ellipse equation based on the annular spot image. Based on the obtained parameters of the elliptic equation, the sphere power of the eye to be measured and the astigmatism power of the eye to be measured can be obtained.

Further alternatively, the annular spot forming unit includes an annular lens, that is, the incident light passes through the annular lens to form the annular spot image described above.

Preferably, in a further aspect of the present disclosure, an array of annularly arranged sub-lenses is provided instead of annular lenses, which form a discontinuous annular spot image, on the basis of which the control module fits a continuous annular image, the parameters of the elliptic equation being obtained in the same way.

Instead of using a set of annular sub-lenses, a plurality of concentric sets of annular sub-lens arrays may be arranged, i.e. the number of annular rings N is not less than 1, preferably N is 1, N is 2, N is 3, N is 4 or N is 5. The more concentric rings, the greater the accuracy of fitting the ellipse resolution. The elliptical light spots are obtained by adopting the sub-lens arrays which are circularly arranged, and the elliptical light spots are actually fitted, so that the cost for obtaining the annular lenses can be effectively reduced, in addition, in the actual production, the product manufacturing precision is easier to control, and the measurement precision of the refraction measuring device is improved.

The refraction measuring device according to the first aspect preferably further comprises a fixation target unit, which may be selected from a liquid crystal display, a plasma display, an electroluminescent display, an organic light emitting display, an illuminated chart, an illuminated microstructure. Further preferably, pupil imaging means are included. The pupil imaging device is used for acquiring the tested eye image, wherein the pupil imaging device comprises a pupil illumination mechanism and a pupil imaging camera. The pupil imaging camera optionally includes a focusing lens.

In another aspect of the present disclosure, a portable refractometer is provided employing the refractive measuring device of the above aspect.

Preferably, the portable optometry device of the present disclosure, wherein the pupil imaging device comprises a pupil illumination mechanism, a pupil imaging camera with a focusing lens. The long-distance operation mode and the short-distance operation mode can be set by controlling the focusing lens.

The long-distance working mode provides a working mode of binocular imaging, when eyes are at a certain distance, the distance is generally 1 meter or more, the eyes of a tested person watch the target on the instrument at the same time, and images of the eyes are shot. The eye images acquired in the remote mode of operation are characterized as image structures of the upper eyelid, lower eyelid, iris and pupil via the control module. In a remote working mode, the positions of the irises of the left eye and the right eye in the eyebox can be extracted, and strabismus is screened through the position relation between the irises of the eyes and the eyebox.

The short-distance working mode is an operation mode applied in the optometry process, the distance between an optometry instrument and a human eye is generally 30mm, and pupils are imaged to assist in operating the human eye to align the instrument with the pupils of the human eye so as to finish optometry. Because the instrument is 30mm away from the pupil, the camera shooting the pupil image needs to be focused, and the working distance is adjusted to be 30mm from the working distance of 1 meter in binocular imaging.

[ Advantageous effects of the invention ]

The refraction measuring device of the present disclosure can achieve complete objective refraction detection, essentially without requiring a subject to respond.

In the prior art, objective refraction detection is adopted, and a Hartmann wavefront sensor is adopted, which is a method for dividing wavefront by a micro lens array, and further obtaining wavefront error by analyzing the deviation of light spots in a sub-aperture and ideal light spots.

In the preferred mode of the disclosure, based on the annular arrangement sub-lens array, after the beacon light reflected by the fundus passes through the sub-lens array, the central point of the focusing light spot of the sub-lens presents elliptical (circular when no diopter exists) distribution due to the influence of the refractive error of the eye, the central point of the annular arrangement array is fitted to an ellipse with the symmetrical center being the center of the annular arrangement sub-lens array, the general equation is a+ bXY +cX ²+dY² =0, the value of a, b, c, d can be solved by taking into the equation according to the obtained central point coordinate value of the light spot, and then the refractive data of the eye to be measured can be obtained, including the sphere power, the astigmatism and the astigmatism axial direction.

According to the technical scheme, more concise component arrangement is adopted. The beacon light reflected by the fundus is received by the annular arrangement sub-lenses to finish optometry, and the manufacturing cost is lower than that of a conventional Hartmann wavefront sensor, so that the cost of a detection device is effectively reduced, and more flexible, more optional and practical implementation means are provided.

The portable optometry instrument provided by the disclosure adopts the refraction measuring device, and is used for realizing objective vision detection and screening of refraction correction. Further, in one preferred aspect, the pupil imaging device is set to a long-distance operation mode and a short-distance operation mode by a simple focusing operation. The remote working mode can be used for strabismus screening, so that the functions of the equipment are more perfect.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

FIG. 1 schematically illustrates an optical path arrangement of one embodiment of a refractive measurement apparatus of the present disclosure;

FIG. 2 schematically illustrates one embodiment of an annular spot forming unit consisting of an array of sub-lenses;

FIG. 3 schematically illustrates an image of annularly arranged spots formed by the annular spot forming unit shown in FIG. 2;

FIG. 4 schematically illustrates another embodiment of an annular spot forming unit, which is formed by an array of sub-lenses;

FIG. 5 is a schematic view of an annular spot forming unit and its imaging in accordance with another embodiment, wherein the annular spot forming unit is formed by an annular lens;

FIG. 6 is a block diagram of a layout of one embodiment of a portable optometer of the present disclosure showing a close range mode of operation;

FIG. 7 is a view of the portable optometry of the present disclosure shown in FIG. 6 in use in a remote mode of operation;

FIG. 8 is a block diagram of an information flow;

FIG. 9 shows pupil images transmitted to the control module and displayed on the operating display screen for guiding the operator to achieve alignment of the pupil of the eye under test with the instrument's optical axis, an

Fig. 10 shows a binocular image of remote mode extraction.

Reference numerals illustrate:

1. Eyes (eyes)

2. First spectroscope

3. Second beam splitter

4. Pupil imaging camera

5. Beacon light source collimating mirror

6. Beacon light source

7. First focusing lens

8. Second focusing lens

9. Third spectroscope

10. Optotype imaging objective lens

11. Fixation target

12. Annular light spot forming unit

13. Facula image extraction mechanism

15. Sub-lens

110. Instrument outer casing

130. Operation prompt screen

140. Control module

150. Optical module

160. Eye positioning hole to be measured

501. Annular lens

502. Optical axis

503. Flare image

504. Center portion of annular lens

1000. Portable optometry instrument

Detailed Description

The present disclosure is described in further detail below with reference to the drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant content and not limiting of the present disclosure. It should be further noted that, for convenience of description, only a portion relevant to the present disclosure is shown in the drawings.

Unless otherwise indicated, the exemplary implementations/embodiments shown are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Thus, unless otherwise indicated, features of the various implementations/embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concepts of the present disclosure.

The use of cross-hatching and/or shading in the drawings is typically used to clarify the boundaries between adjacent components. As such, the presence or absence of cross-hatching or shading does not convey or represent any preference or requirement for a particular material, material property, dimension, proportion, commonality between illustrated components, and/or any other characteristic, attribute, property, etc. of a component, unless indicated. In addition, in the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. While the exemplary embodiments may be variously implemented, the specific process sequences may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in reverse order from that described. Moreover, like reference numerals designate like parts.

When an element is referred to as being "on" or "over", "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to," or "directly coupled to" another element, there are no intervening elements present. For this reason, the term "connected" may refer to physical connections, electrical connections, and the like, with or without intermediate components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "under," above, "" upper, "" above, "" higher, "and" side (e.g., as in "sidewall") to describe one component's relationship to another (other) component as shown in the figures. In addition to the orientations depicted in the drawings, the spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture. For example, if the device in the figures is turned over, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "below" may encompass both an orientation of "above" and "below. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising," and variations thereof, are used in the present specification, the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof is described, but the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximation terms and not as degree terms, and as such, are used to explain the inherent deviations of measured, calculated, and/or provided values that would be recognized by one of ordinary skill in the art.

In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "a particular example," "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

Example 1

As shown in fig. 1, which schematically illustrates the optical path arrangement and measurement operation of the refractive measurement device of the present disclosure.

First, the pupil alignment step is completed for the eye 1 to be measured.

Then, the detection light source, which in the embodiment is the beacon light source 6, is turned on. The light emitted by the beacon light source 6 is collimated into parallel light by the beacon light collimating lens 5, and then enters the eye 1 to be detected through the second spectroscope 3 and the first spectroscope 2. Then, the fundus retroflected light of the eye 1 passes through the first spectroscope 2, the first focusing lens 7, the second focusing lens 8 and the third spectroscope 9, passes through the annular light spot forming unit 12, and then enters the light spot image extraction mechanism 13 (imaging device), and the light spot image extraction mechanism 13 acquires annular or circumferentially arranged light spot images.

In the present embodiment, the annular spot forming unit 12 is a single-ring sub-lens array as shown in fig. 2, which schematically illustrates an array of annularly arranged sub-lenses 15 employed by the annular spot forming unit 12 in the present embodiment. The center of each sub-lens 15 may be fitted to a circle. For vision screening applications, a single-ring lens array, i.e., a number of rings n=1, is preferred from the standpoint of both economy and utility performance tradeoffs. Only one annular sub-lens array is arranged, so that the requirement of calculating diopter by fitting ellipse in vision screening test can be met, and the lens is easy to process and low in processing cost.

Further, the light emitted from the third beam splitter 9 passes through the sub-lens 15 to form a spot. Typically, the center points of the spots formed by the sub-lenses 15 are connected together to fit an ellipse, and in particular, in the case where the measured eye has no astigmatism, the array formed by the spots may fit a circle, as illustrated in fig. 3. In other words, when the human eye has diopters, including near or far vision accompanied by astigmatism, the typical fitted image is an ellipse, especially when there is no astigmatism, the fitted image is a circle, that is to say the simple near/far vision fitted image is a circle, and the fitted image is an ellipse when there is astigmatism.

The spot image extracting means 13 may be an imaging device, optionally a CCD camera. The spot image is extracted and transmitted to the control module 140 (not shown in fig. 1) for data processing.

Fitting the center point of the annular array of light spot images to an ellipse with the center being the center of the annular array of sub-lenses, wherein the general equation is e+ fXY +gX ²+hY² =0, and according to the obtained coordinate value of the center point of the light spot, carrying the coordinate value into the equation to solve the e, f, g, h value to determine the ellipse equation.

The included angle between the elliptic short axis and the x-axis in the Cartesian coordinate system is alpha, and the rotation axis equation is calculated

X=xcosα-ysinα

Y=xsinα+ycosα

After the elimination X, Y of the ellipse equation with the above determination, the ellipse equation is reduced to:

x²/a²+y²/b²=1

wherein a is the sphere power of the measured eye, b-a is the astigmatism power of the measured eye, alpha is the astigmatism axis, and in particular, when a=b, the ellipse is a circle, and the measured eye has no astigmatism power.

In the present embodiment, a fixation target 11 is also provided. During the refractive measurement of the eye under test, a fixed pattern, such as a cross, is displayed on the fixation target 11, which is imaged by the optotype imaging objective 10 onto the retina of the eye under test 1, and during the measurement, the subject ensures a stable eye position during the measurement by staring at the pattern.

The fixation target module may be selected from a liquid crystal display, a plasma display, an electroluminescent display, an organic light emitting display, an illuminated chart, an illuminated microstructure.

Example 2

This embodiment differs from embodiment 1 in that a multi-ring sub-lens array is employed.

The present disclosure employs sub-lens sub-arrays to achieve the effect of a ring lens. The number N of the sub-lens arrays is more than or equal to 1. When n=1, as shown in fig. 2, there is only one circularly arranged sub-lens array, and when n=2, there are two concentric circles of circularly arranged sub-lens arrays. Further variant embodiments, for example n=3, provide a three-turn concentric arrangement of the sub-lens arrays. Further variant embodiments, for example n=4, provide a four-turn concentric arrangement of the sub-lens arrays. Further variant embodiments, for example n=5, provide a five-turn concentric arrangement of the sub-lens arrays. The more concentric rings, the greater the accuracy of fitting the ellipse resolution.

The elliptical light spots are obtained by adopting the sub-lens arrays which are circularly arranged, and the elliptical light spots are actually fitted, so that the cost for obtaining the annular lenses can be effectively reduced, in addition, in the actual production, the product manufacturing precision is easier to control, and the measurement precision of the refraction measuring device is improved.

The advantage of increasing the number of rings is that the average value can be calculated as the final measurement result after calculating diopter with different rings, improving the measurement accuracy.

Example 3

This embodiment is different from embodiments 1,2 in that the main constituent member of the annular spot forming unit 12 is an annular lens.

Fig. 5 schematically shows an arrangement of annular lenses. The annular lens 501 is configured to be rotated 360 ° about the optical axis 502 by one lens section. The central portion 504 of the annular lens is of a light-blocking or hollow design.

Diopter measurement is as follows:

Pupil alignment is first performed. After the pupil alignment step is completed, the beacon light source 6 is turned on, the beacon light source 6 is collimated into parallel light through the beacon light collimating lens 5, and then enters the eye 1 to be detected through the second spectroscope 3 and the first spectroscope 2. Then, the fundus retroflected light of the eye 1 passes through the first spectroscope 2, the first focusing lens 7, the second focusing lens 8 and the third spectroscope 9, and enters the facula image extraction mechanism 13 after being imaged by the annular lens 501, and the facula image extraction mechanism 13 collects the facula images 503 which are distributed in an annular mode. Then, the annular light spot image 503 is processed, the center line of the annular light spot image 503 is extracted and fitted into an ellipse, the general equation is e+ fXY +gX ²+hY² =0, coordinate values of different positions are taken, and the value of e, f, g, h can be solved by taking the equation into the equation to determine the ellipse equation. The remaining treatments were similar to those of examples 1,2 above.

Example 4

The present embodiment provides a portable optometer 1000.

As shown in fig. 6,7 and 8, portable optometry 1000 includes an instrument housing 110, an operation prompt screen 130, a control module 140 and an optical module 150.

In this embodiment, the operation prompt screen 130 is mounted on the instrument housing 110 and is disposed to face the operator during use, so as to facilitate the operator to obtain measurement information, operation prompts, and the like.

The optical module 150 employs the optical path system shown in fig. 1, that is, the refractive device preferably employs the refractive devices of embodiments 1-3 described above.

The portable optometry 1000 of the present embodiment provides both binocular imaging and monocular imaging functions. Fig. 6 shows a single eye positioned adjacent to the eye to be measured positioning hole 160, with which single eye imaging is performed. During the measurement, the operator may move portable optometry apparatus 1000 such that the optical center of the apparatus (the main optical axis as shown in fig. 1) is aligned with the pupil center of eye 1 (as shown in fig. 9).

In addition, as shown in fig. 7, the distance between the portable optometry 1000 and the person to be tested is increased, so that the distance between the eyes to be tested and the portable optometry 1000 is kept more than 1 meter, the near vision effect of the eyes is satisfied, and the process is used as a long-distance working mode for performing binocular imaging.

The pupil imaging camera 4 as shown in fig. 1, which includes a focusing lens, can focus in correspondence with the short-distance and long-distance operation modes, respectively, to meet the requirements of the corresponding operation modes. The focusing operation button of the pupil camera 4 can be arranged on the outer surface of the shell 110, so that an operator can conveniently and manually focus. It may be configured that an operation instruction is input to the control module 140 through the operation prompt screen 130, and the control module 140 instructs and controls the action mechanism to act, for example, the servo motor operates the relevant focusing mechanism.

The vision screening operation of portable optometry 1000 is illustrated below:

1. Binocular imaging

After the optometry instrument is started, optionally, a binocular imaging link is firstly entered. The process needs the distance between eyes and a shooting instrument to be more than 1 meter, and the effect of near vision and distance of eyes is met.

When the optometry is 1 meter away from the eyes, both eyes of the measured person simultaneously look at the eye positioning holes 160 to be measured on the optometry, and the pupil imaging camera 4 provided in the optical module 150 is used to capture images of both eyes at this time.

The extracted binocular image information is transmitted to the control module 140, and the image recognition algorithm stored in the processing module built in the control module 140 recognizes the eye socket, iris and pupil structures, and the two-eye image information is displayed on the operation prompt screen 130 and stored for judging the positions of the two-eye iris structures and the pupils in the two-eye sockets respectively, and the binocular image is illustrated in fig. 10.

The long-distance pupil imaging of the two eyes can be used for screening strabismus. In this embodiment, a scheme of adding a focusing lens to the pupil imaging portion to capture long-distance binocular images is adopted, so that strabismus screening can be realized on the premise of not adding a complex structure.

2. Pupil alignment

As described above and shown in fig. 6, the single eye to be measured is brought close to the eye positioning hole 160 to be measured, and single eye imaging is performed. When the pupil alignment is performed, the front end of the portable optometry device 1000 is brought into close contact with the forehead of the subject, and the pupil of the subject is illuminated by an infrared light source (not shown). Focusing the pupil imaging camera 4 to enable the pupil imaging camera to be in a close-range working mode to clearly image pupils, and positioning the pupils before optometry. For convenient operation, can set up the button on the refractor shell, the switching operation of two focusing modes of pupil imaging camera is realized to a key.

As shown in fig. 9, pupil image information is transmitted to the control module 140, the control module 140 extracts a pupil image and marks a pupil center point, the control module 140 displays relevant information on the operation prompt screen 130, and an operator moves the front end of the optometry device to lean against the forehead according to the pupil image displayed on the operation prompt screen 130 and the marked pupil center point, and the optometry device is moved up and down and left and right by moving the optometry device, so that an optometry device optical axis auxiliary line displayed on the operation prompt screen 130 coincides with the pupil center point, and pupil alignment is completed.

3. Ametropia measurement of eye

See description of examples 1-3 above for measurement of ocular refractive errors.

Further, to achieve compact arrangement of the portable refractor 1000 and provide a purely objective refractor for rapid screening of ametropia, in this embodiment, the ametropia is not corrected to perform subjective refraction, and thus, the focusing lens group in the optical module 150 is fixedly set, i.e., fixedly preset according to the eye with normal refraction. In the embodiment, the distance between the first focusing lens 7 and the second focusing lens 8 is fixedly set, and the manual knob for the focusing lens group is not arranged on the optometry apparatus, that is, correction refraction is not performed, and functional components required by the measured eye to judge the optotype display after the correction refraction are not arranged.

The present disclosure includes at least the following concepts:

Concept 1. A refractive measuring device, comprising:

A detection light source that emits detection light;

A light source lens group that irradiates the detection light to the eye to be examined;

An imaging lens group including an annular spot forming unit;

The spot image extraction mechanism is used for collecting annular spot images formed by the imaging lens group;

and the control module is used for receiving the annular light spot image information acquired by the light spot image extraction mechanism and determining a refraction detection result.

Concept 2. The refractive measuring device according to concept 1, wherein the annular spot forming unit comprises an annular lens.

Concept 3. The refractive measurement apparatus of concept 1, wherein the annular spot forming unit comprises an annular arrangement of sub-lens arrays.

The refractive measuring device according to concept 3, wherein the annular sub-lens array is composed of polygonal or circular sub-lenses uniformly distributed about the center, and the annular number N of the annular sub-lens array arranged in the radial direction is 1, 2, 3, 4 or 5.

Concept 5. The refractive measurement apparatus of concept 1, further comprising a fixation target unit.

Concept 6. A portable refractometer employing the refractive measuring device of any of concepts 1-5.

Concept 7. The portable optometry apparatus of concept 6 further comprising pupil imaging means.

Concept 8. The portable optometry apparatus of concept 7, wherein the pupil imaging device comprises a pupil illumination mechanism, a pupil imaging camera having a focus lens, a distance operation mode and a near operation mode being settable by controlling the focus lens.

The portable optometry of claim 8, wherein in the near mode of operation the pupil imaging camera acquires pupil images of the eye under test.

Concept 10. The portable optometer of concept 8, wherein in the remote mode of operation, the pupil imaging camera acquires images of both eyes of the subject, and the identified images are characterized by the control module as image structures of the upper eyelid, lower eyelid, iris and pupil.

It will be appreciated by those skilled in the art that the above-described embodiments are merely for clarity of illustration of the disclosure, and are not intended to limit the scope of the disclosure. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present disclosure.

Claims

1. A portable ophthalmometer, characterized in that it adopts a refraction measuring device, and the refraction measuring device comprises:

a detection light source, which emits detection light;

A light source lens assembly, which emits the detection light into the eye to be detected;

An imaging lens group, comprising an annular light spot forming unit;

A light spot image extraction mechanism for collecting an annular light spot image formed by the imaging lens group;

a control module, which receives the annular spot image information acquired by the spot image extraction mechanism and determines the refraction detection result,

Wherein, the annular spot forming unit comprises an annularly arranged sub-lens array,

The annularly arranged sub-lens array is composed of polygonal or circular sub-lenses uniformly distributed about the center, and the number N of rings arranged in the annularly arranged sub-lens array along the radial direction is 2, 3, 4 or 5.

2. The portable ophthalmometer according to claim 1, further comprising a fixation target unit.

3. The portable ophthalmometer according to claim 1, further comprising a pupil imaging device.

4. The portable ophthalmometer as described in claim 3 is characterized in that the pupil imaging device includes a pupil lighting mechanism and a pupil imaging camera with a focusing lens, and the long-distance working mode and the close-distance working mode are set by controlling the focusing lens.

5. The portable ophthalmometer according to claim 4, characterized in that, in the close-range working mode, the pupil imaging camera obtains the pupil image of the measured eye.

6. The portable ophthalmometer as described in claim 5 is characterized in that, in the long-distance working mode, the pupil imaging camera obtains images of the subject's eyes, and the control module features the recognized images into image structures of the upper eyelid, lower eyelid, iris and pupil.