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WO2006013579A1 - Caméra rétinienne ou rétinographe - Google Patents

Caméra rétinienne ou rétinographe Download PDF

Info

Publication number
WO2006013579A1
WO2006013579A1 PCT/IN2005/000224 IN2005000224W WO2006013579A1 WO 2006013579 A1 WO2006013579 A1 WO 2006013579A1 IN 2005000224 W IN2005000224 W IN 2005000224W WO 2006013579 A1 WO2006013579 A1 WO 2006013579A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
retinal
camera
fundus camera
image
Prior art date
Application number
PCT/IN2005/000224
Other languages
English (en)
Other versions
WO2006013579A8 (fr
Inventor
Satish Chander Gupta
Original Assignee
Satish Chander Gupta
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Satish Chander Gupta filed Critical Satish Chander Gupta
Publication of WO2006013579A1 publication Critical patent/WO2006013579A1/fr
Publication of WO2006013579A8 publication Critical patent/WO2006013579A8/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/14—Arrangements specially adapted for eye photography
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/12—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes

Definitions

  • This invention relates to a retinal or fundus camera.
  • the retinal or fundus camera of the present invention is adapted to provide a photo documentation of the retina of the eye.
  • an examination of the retina is effected by an ophthalmoscope.
  • the basic requirement of an ophthalmoscope, whether it be direct or indirect, is to illuminate the retina, which can then be focused onto the eye of an examining doctor.
  • the focusing of the illuminated retina is effected by a system of lenses provided in the ophthalmoscope.
  • An ophthalmoscope may be a direct or indirect ophthalmoscope.
  • With a direct ophthalmoscope the images are erect, magnified and virtual.
  • direct ophthalmoscope the images formed are inverted, small or less magnified and real.
  • a disadvantage associated with direct ophthalmoscope is that it does not have a wide field.
  • Fundus or retinal cameras presently known in the art have a circular source of light besides the lens system.
  • a disadvantage associated with such a camera is that the source of light touches the periphery of the cornea.
  • the source of light comprises a u.v. source which touches the globe of the eye.
  • Both of such known cameras are contact cameras having the distinct advantage of a wide field of view of the retina.
  • a disadvantage associated with such known cameras is that of the contact between the eye and the light source. Such a contact could result in transmission of infection and chances of causing injury to the eye.
  • Yet another disadvantage is that the magnification is small.
  • U.S. Patent No. 4,810,084 describes a retinal camera having an illumination source and an optical system for projecting the light onto a retina under examination.
  • the camera further comprises a filter means disposed substantially conjugate to the retina of the eye so as to illuminate the eye.
  • the filter means comprise at least one filter member with a disc shaped transmitting base plates, a first and second circular semi-transmitting surface. Such a camera had a complicated illumination optical means.
  • An object of this invention is to propose a retinal or fundus camera which is portable and no longer bulky.
  • Another object of this invention is to propose a retinal or fundus camera, which has a wide field.
  • Still another objection of this invention is to propose a retinal or fundus camera, which no longer contacts the eye.
  • Yet another object of this invention is to propose a retinal or fundus camera, which has a simple optical system.
  • a further object of this invention is to propose a retinal or fundus camera, which is efficient.
  • a retinal or fundus camera comprising:
  • the first lens could have a power of 60 to 90 dioptres, as greater the power of the lens, larger is the field of view.
  • a lens comprises a biconvex aspherical lens.
  • the second lens has a power less than that of said first lens, such as 20 to 30 dioptres, so as to provide a greater magnification of the retinal image and to act as a close up lens for the camera.
  • Such a lens comprises also a biconvex aspherical lens.
  • the lens system has a varying power of 20 to 90 D.
  • the first lens should have a higher power such as 60 to 90D, so that the field of view increases.
  • the power of said first lens should not be higher than that 90 dioptres, as the lens would then be too close to the eye ball under examination.
  • a magnification of the image is achieved by the second lens.
  • the distance between said first and second lens is the sum of the focal length of the first and second lens.
  • Fig 1. shows the camera of the present invention
  • Fig 2. shows the optical system.
  • the camera 1 comprises a housing 2 extending into a tubular extension 3. A power source since a battery 4 is disposed within housing 1. Housing 2 has a digital camera back plate 5 with a card 6 disposed therein.
  • the camera has an optical system to comprise a source light S 1 adapted to be connected to the power source 4.
  • a condensing lens which is a piano convex lens L 3 is provided in the proximity of light source S 1 so as to transmit the light onto a mirror M 1 .
  • Light from mirror M 1 is focused onto the retina of a patient through lens L 1 .
  • lens L 1 has a high power such as 60 to 90 dioptres, so as to provide a wide field of view for example, upto 110°
  • Lens L 1 receives the image of the retina at its focal point F 1 , which is then transmitted to a second lens L 2 having a power less than that of lens L 1 .
  • lens L 2 acts as a magnifying lens and a close up lens for the camera.
  • the image is at the focal length of lens L 2 , which is greater than the focal length of lens L 1 .
  • the light from mirror M1 is diposed such that it is almost coaxial with the receiving optics.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

La rétinal ou le rétinographe comprend : (i) une source de lumière (1) installée à l’intérieur de la caméra (1) et éloignée de l’œil du malade. (ii) une première lentille (L1) à l’intérieur de la caméra pour concentrer la lumière provenant par exemple de la source de lumière jusqu’à la rétine et donnant une visualisation à champ large de la rétine. (iii) une seconde lentille (L2) pour recevoir ladite image et causant un agrandissement de l’image rétinienne ; (iv) une caméra numérique pour l’enregistrement de l’image.
PCT/IN2005/000224 2004-08-02 2005-06-30 Caméra rétinienne ou rétinographe WO2006013579A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1435DE2004 2004-08-02
IN1435/DEL/04 2004-08-02

Publications (2)

Publication Number Publication Date
WO2006013579A1 true WO2006013579A1 (fr) 2006-02-09
WO2006013579A8 WO2006013579A8 (fr) 2007-09-27

Family

ID=35786911

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2005/000224 WO2006013579A1 (fr) 2004-08-02 2005-06-30 Caméra rétinienne ou rétinographe

Country Status (1)

Country Link
WO (1) WO2006013579A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8740383B2 (en) 2009-05-06 2014-06-03 University Of Virginia Patent Foundation Self-illuminated handheld lens for retinal examination and photography and related method thereof
US9155466B2 (en) 2012-03-17 2015-10-13 Visunex Medical Systems Co. Ltd. Eye imaging apparatus with a wide field of view and related methods
US9179840B2 (en) 2012-03-17 2015-11-10 Visunex Medical Systems Co. Ltd. Imaging and lighting optics of a contact eye camera
US9357920B2 (en) 2009-09-04 2016-06-07 University Of Virginia Patent Foundation Hand-held portable fundus camera for screening photography
US9655517B2 (en) 2012-02-02 2017-05-23 Visunex Medical Systems Co. Ltd. Portable eye imaging apparatus
US9848773B2 (en) 2015-01-26 2017-12-26 Visunex Medical Systems Co. Ltd. Disposable cap for an eye imaging apparatus and related methods
US9986908B2 (en) 2014-06-23 2018-06-05 Visunex Medical Systems Co. Ltd. Mechanical features of an eye imaging apparatus
US10258309B2 (en) 2012-02-02 2019-04-16 Visunex Medical Systems Co., Ltd. Eye imaging apparatus and systems

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2512427A1 (de) * 1974-07-05 1976-01-22 Jenoptik Jena Gmbh Ophthalmoskop zur beobachtung und fotografie des augenhintergrundes
WO2000021432A1 (fr) * 1998-10-15 2000-04-20 Ophthalmic Imaging Systems, Inc. Procedes et appareil d'imagerie oculaire numerique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2512427A1 (de) * 1974-07-05 1976-01-22 Jenoptik Jena Gmbh Ophthalmoskop zur beobachtung und fotografie des augenhintergrundes
WO2000021432A1 (fr) * 1998-10-15 2000-04-20 Ophthalmic Imaging Systems, Inc. Procedes et appareil d'imagerie oculaire numerique

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8740383B2 (en) 2009-05-06 2014-06-03 University Of Virginia Patent Foundation Self-illuminated handheld lens for retinal examination and photography and related method thereof
US9357920B2 (en) 2009-09-04 2016-06-07 University Of Virginia Patent Foundation Hand-held portable fundus camera for screening photography
US11013406B2 (en) 2009-09-04 2021-05-25 University Of Virginia Patent Foundation Removal of non-retinal opthalmic reflections in retinal imaging
US11813024B2 (en) 2009-09-04 2023-11-14 University Of Virginia Patent Foundation Hand-held portable fundus camera for screening photography
US9655517B2 (en) 2012-02-02 2017-05-23 Visunex Medical Systems Co. Ltd. Portable eye imaging apparatus
US10258309B2 (en) 2012-02-02 2019-04-16 Visunex Medical Systems Co., Ltd. Eye imaging apparatus and systems
US9155466B2 (en) 2012-03-17 2015-10-13 Visunex Medical Systems Co. Ltd. Eye imaging apparatus with a wide field of view and related methods
US9179840B2 (en) 2012-03-17 2015-11-10 Visunex Medical Systems Co. Ltd. Imaging and lighting optics of a contact eye camera
US9351639B2 (en) 2012-03-17 2016-05-31 Visunex Medical Systems Co. Ltd. Eye imaging apparatus with a wide field of view and related methods
US9907467B2 (en) 2012-03-17 2018-03-06 Visunex Medical Systems Co. Ltd. Eye imaging apparatus with a wide field of view and related methods
US9986908B2 (en) 2014-06-23 2018-06-05 Visunex Medical Systems Co. Ltd. Mechanical features of an eye imaging apparatus
US9848773B2 (en) 2015-01-26 2017-12-26 Visunex Medical Systems Co. Ltd. Disposable cap for an eye imaging apparatus and related methods

Also Published As

Publication number Publication date
WO2006013579A8 (fr) 2007-09-27

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