WO2009083419A1 - Dispositif pour photographier avec peu de reflets le fond de l'œil, avec une tolérance améliorée vis-à-vis des décalages latéraux - Google Patents

Dispositif pour photographier avec peu de reflets le fond de l'œil, avec une tolérance améliorée vis-à-vis des décalages latéraux Download PDF

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Publication number
WO2009083419A1
WO2009083419A1 PCT/EP2008/067351 EP2008067351W WO2009083419A1 WO 2009083419 A1 WO2009083419 A1 WO 2009083419A1 EP 2008067351 W EP2008067351 W EP 2008067351W WO 2009083419 A1 WO2009083419 A1 WO 2009083419A1
Authority
WO
WIPO (PCT)
Prior art keywords
illumination
fundus
eye
pupil
beam path
Prior art date
Application number
PCT/EP2008/067351
Other languages
German (de)
English (en)
Inventor
Felix Margadant
Original Assignee
Ophthametrics Ag
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 Ophthametrics Ag filed Critical Ophthametrics Ag
Priority to DE212008000091U priority Critical patent/DE212008000091U1/de
Priority to CH01033/10A priority patent/CH700526B1/de
Publication of WO2009083419A1 publication Critical patent/WO2009083419A1/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
    • A61B3/15—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing
    • A61B3/156—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing for blocking
    • 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

  • the present invention relates to a device for imaging the ocular fundus or a section thereof. On the one hand, it can be used for the ophthalmological examination of the ocular fundus and, on the other hand, for the identification of a person on the basis of structures of the ocular fundus, preferably the course of blood vessels.
  • fundus cameras are used to image the fundus (fundus oculi).
  • light must enter the eye through the narrow pupil of the eye and, on the other hand, the light reflected from the fundus of the eye must be registered by means of a recording camera.
  • the illumination path and the receiving path must be guided locally separately, otherwise the light reflected from the cornea and the eye lens outshines the light reflected from the fundus.
  • the pupil diameter of the eye is only a few millimeters
  • the division of the illumination and exposure path is a decisive factor for the quality of the images obtained. Furthermore, this division is crucial for the tolerance against lateral displacement of the recording device relative to the optical axis of the eye.
  • the illumination and imaging beam path is typically made coaxial, e.g. the circular surface of the pupil is divided into an outer annular surface (1) for illumination and a circular central surface (2) for the reception.
  • this coaxial division of the available pupil opening requires that the eye with respect to the optical axis of the Imaging device must be positioned very accurately. This is especially important if the image is to be taken without any dilatation of the pupil, since then the pupil diameter can be less than 4 mm. If the pupil diameter is small, the illumination ring must be positioned exactly centrically in the pupil, otherwise only part of the light will be in the eye and the image will be correspondingly less bright or even unusable. This lateral offset also allows reflexes from the cornea to enter the camera and outshine the light from the fundus.
  • the invention solves the problem with a device having the features of claim 1.
  • a punctiform light source (3) for example an LED, whose spot is not larger than 1 mmx1 mm, an image on the cornea (7) by means of optics (4) via a beam splitter (5) and an ophthalmological lens (6) of the eye.
  • a 1: 1 image is assumed, resulting in a light spot (9) of 1 mm x 1 mm in size on the cornea.
  • the rest of the pupil opening (10) is available for imaging. For example, if the pupil has a diameter of 4 mm, then a displacement tolerance of up to 3 mm results.
  • the displacement tolerance is much smaller: If in the center enough space for an imaging beam path (2) should remain at least 1 mm in diameter and because in practice the width of the ring can not be made arbitrarily small diameter of the outer lighting ring (1) amount to a minimum of about 3mm. The displacement tolerance is only about 1 mm in this example. It is a further feature of the invention that the illumination beam path (11) can be arranged such that after the beam splitter (5) the illumination beam path to the imaging beam path (12) is slightly tilted and / or laterally offset.
  • the unavoidable light reflection from the cornea does not get into the recording camera (8) and, on the other hand, that only a peripheral part of the fundus of the eye is illuminated.
  • the latter can be advantageous for reducing the glare effect, if - as for example for the purpose of identifying a person - only the environment of the optic nerve should be imaged.
  • the illuminated area can additionally be reduced by means of an aperture introduced into the illumination beam path. It is a further advantage of the invention that from the surface of the pupil (11) only a small, point-shaped part (9) has to be used for the illumination beam path and the remainder of the surface is available for the light exit.
  • the invention-based division of the pupil is brighter than a coaxial beam path.
  • the device is positioned so that the illumination point is e.g. in the lower half of the pupil comes to rest and the upper area for the light emission or the image is available.
  • any distortions caused by the spectacle lens are less pronounced in the case of point illumination than in the case of ring illumination.
  • the reason for this is the smaller extent of the light spot compared to a lighting ring.
  • the device is intended to record images of the ocular fundus without drug dilation of the pupil.
  • the intensity of the illumination should be as small as possible, so that the pupil reflex is not triggered, which reduces the pupil diameter by contracting the iris (10a). Also for this reason is one the largest possible area of the receiving path advantageous.
  • the dazzling effect can be additionally reduced by switching on the illumination only for a short time, typically 10-20ms.
  • a highlighter can be superimposed on another beam splitter (13) and a lens (14), which specifies the viewing direction of the eye to be examined and facilitates fixation.
  • a lens 14
  • the highlighter can also be switched off.
  • the point light source via the lens (4) is converted into a parallel beam and deflected via the beam splitter (5) partially in the direction of the eye.
  • the ophthalmic lens (6) focuses this parallel beam on the cornea (7) of the eye (16). Inside the eye, the focused beam focusses and illuminates a larger part of the fundus.
  • the reflected light from the fundus is converted by the ophthalmic lens (6) into a parallel beam, passes through the beam splitter and is projected by the lens (8a) onto the CCD chip of the imaging camera (8).
  • the highlighter (15) is imaged sharply on the retina of the eye by the lens (14).

Abstract

Ce dispositif sert à photographier sans reflets ou avec peu de reflets le fond de l'œil et se distingue par une tolérance relativement élevée vis-à-vis de décalages latéraux de l'œil par rapport au dispositif. Il comprend une source ponctuelle qui est projetée au moyen d'une optique appropriée et via un diviseur de faisceau sur la cornée, et ce de telle sorte que le point d'image vient par exemple se placer dans la moitié inférieure de la pupille. Le reste de la pupille est alors disponible pour recevoir la lumière sortante. La lumière sortante est projetée au moyen d'une optique appropriée dans un appareil de prise de vues, et y est enregistrée. Les images sont disponibles pour des examens ophtalmologiques ou pour l'identification de personnes.
PCT/EP2008/067351 2007-12-30 2008-12-11 Dispositif pour photographier avec peu de reflets le fond de l'œil, avec une tolérance améliorée vis-à-vis des décalages latéraux WO2009083419A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE212008000091U DE212008000091U1 (de) 2007-12-30 2008-12-11 Vorrichtung zur reflexarmen fotografischen Aufnahme des Augenhintergrundes mit verbesserter Toleranz gegen seitliche Verschiebungen
CH01033/10A CH700526B1 (de) 2007-12-30 2008-12-11 Vorrichtung zur reflexarmen fotografischen Aufnahme des Augenhintergrundes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CHCH07/02023 2007-12-30
CH20232007 2007-12-30

Publications (1)

Publication Number Publication Date
WO2009083419A1 true WO2009083419A1 (fr) 2009-07-09

Family

ID=40568421

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/067351 WO2009083419A1 (fr) 2007-12-30 2008-12-11 Dispositif pour photographier avec peu de reflets le fond de l'œil, avec une tolérance améliorée vis-à-vis des décalages latéraux

Country Status (1)

Country Link
WO (1) WO2009083419A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0563454A1 (fr) * 1992-03-30 1993-10-06 Henning Dipl.-Phys. Stiller Procédé et dispositif pour examiner les yeux
US5504543A (en) * 1994-07-25 1996-04-02 Nikon Corporation Ophthalmic photographing apparatus having control means for stopping the operation and fixing the in-focus state
US5861939A (en) * 1997-10-16 1999-01-19 Odyssey Optical Systems, Llc Portable fundus viewing system for an undilated eye
EP0941692A1 (fr) * 1998-03-09 1999-09-15 Herbert Schwind GmbH & Co. KG Méthode et dispositif d'examen de l'oeil
EP1340451A2 (fr) * 2002-02-20 2003-09-03 Nidek Co., Ltd. Dispositif d'examen de l'oeil
JP2006174984A (ja) * 2004-12-22 2006-07-06 Kowa Co 照明装置及びその照明装置を用いた眼科撮影装置
WO2007104165A1 (fr) * 2006-03-13 2007-09-20 Ophthametrics Ag Dispositif d'enregistrement photographique du fond de l'œil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0563454A1 (fr) * 1992-03-30 1993-10-06 Henning Dipl.-Phys. Stiller Procédé et dispositif pour examiner les yeux
US5504543A (en) * 1994-07-25 1996-04-02 Nikon Corporation Ophthalmic photographing apparatus having control means for stopping the operation and fixing the in-focus state
US5861939A (en) * 1997-10-16 1999-01-19 Odyssey Optical Systems, Llc Portable fundus viewing system for an undilated eye
EP0941692A1 (fr) * 1998-03-09 1999-09-15 Herbert Schwind GmbH & Co. KG Méthode et dispositif d'examen de l'oeil
EP1340451A2 (fr) * 2002-02-20 2003-09-03 Nidek Co., Ltd. Dispositif d'examen de l'oeil
JP2006174984A (ja) * 2004-12-22 2006-07-06 Kowa Co 照明装置及びその照明装置を用いた眼科撮影装置
WO2007104165A1 (fr) * 2006-03-13 2007-09-20 Ophthametrics Ag Dispositif d'enregistrement photographique du fond de l'œil

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