EP1838207A1 - Dispositif de focalisation pour appareils ophtalmologiques, notamment pour cameras d'observation du fond de l'oeil, et son procede d'utilisation - Google Patents

Dispositif de focalisation pour appareils ophtalmologiques, notamment pour cameras d'observation du fond de l'oeil, et son procede d'utilisation

Info

Publication number
EP1838207A1
EP1838207A1 EP06701013A EP06701013A EP1838207A1 EP 1838207 A1 EP1838207 A1 EP 1838207A1 EP 06701013 A EP06701013 A EP 06701013A EP 06701013 A EP06701013 A EP 06701013A EP 1838207 A1 EP1838207 A1 EP 1838207A1
Authority
EP
European Patent Office
Prior art keywords
focusing
unit
projection unit
electronically controllable
control unit
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP06701013A
Other languages
German (de)
English (en)
Inventor
Günter Link
Detlef Biernat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Zeiss Meditec AG
Original Assignee
Carl Zeiss Meditec 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 Carl Zeiss Meditec AG filed Critical Carl Zeiss Meditec AG
Publication of EP1838207A1 publication Critical patent/EP1838207A1/fr
Withdrawn legal-status Critical Current

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

Definitions

  • Focusing device for ophthalmic devices in particular fundus cameras and method for its use
  • the invention relates to a method and a device for ophthalmological devices, preferably fundus cameras for examining the ocular fundus by means of an optical system and electronic sensors for image acquisition.
  • non-mydriatic fundus cameras in which the fundus is illuminated by (invisible) infrared light and thus in a darkened If the pupil is sufficiently dilated, the eye is briefly illuminated (eg by means of a flash lamp) with white (visible) light and an image of the fundus is taken.
  • Moving internal optics assemblies creates a sharp, high-contrast image of the patient's fundus on the imager or eye of the observer.
  • non-mydriatic fundus cameras infrared light is principally observed, and the result image is recorded with white light of shorter wavelengths, which have different levels of sharpness for these different wavelengths, resulting in sharp images when observed with infrared light the result image would be blurred in the presence of white light, which is why focusing aids are used in "Non Mydriatic" fundus cameras.
  • this device applies a test mark to the fundus of the eye. graced and evaluated accordingly.
  • the evaluation is carried out by a coincidence method in which two half-marks are brought to cover and so the optimum focus level for white light is determined.
  • a disadvantage in this embodiment proves that the visible light of the test mark despite the low intensity can cause a pupil reaction of the patient and thus significantly complicates working with the ophthalmic device, which requires a minimum pupil diameter.
  • the test mark is generated by means of infrared light.
  • infrared light is reflected due to the spectral properties of the fundus in a deeper tissue layer than that used for image acquisition white light.
  • test mark of a focusing aid at the edge of the pupil is reflected into the eye of the patient via the illumination beam path
  • the observation takes place via the observation beam path through the center of the patient's pupil.
  • the focusing of the test mark results in a complicated, nonlinear relationship between the necessary displacement of the test mark and the optics modules assigned to the test mark. This non-linear relationship can be realized by means of mechanical coupling of the displacements via cams or lever mechanism.
  • Fundus cameras with automatic focus are described in the documents DE 30 31 822 C2 and DE 31 16 380 C2. At least one focusing mark is imaged onto the ocular fundus of a human eye to be examined by an optical projection device.
  • a detector unit determines the position of the focusing mark.
  • an automatic focusing of the fundus camera is performed by a control unit by motor-driven, optical elements for imaging the focusing mark are moved along the optical axis.
  • a three-armed connecting lever is provided which is pivotable about its bearing axis.
  • the first lever arm with a focusing lens and the second lever arm with a siermarken sushi in conjunction to move them in the direction of the optical axis can.
  • the remaining third lever arm is coupled via a pin / slot connection with an actuating shaft, so that when pivoting the actuating shaft, the two other lever arms perform the corresponding movements along the optical axis.
  • US 4,196,979 describes a device for adjusting the distance between an eye and an eye examination device, in particular for examining or photographing the ocular fundus.
  • the device described further includes means for focusing the image on the ocular fundus.
  • This device also consists of an imaging lens and an optical unit for the projection of a focusing mark, which are mechanically coupled and in the direction of the optical Axis can be moved. Again, the necessary synchronization of the modules due to their pronounceünearer movement is very difficult to implement. A compensation of tolerances of the optical assemblies is therefore hardly or not possible.
  • the present invention has for its object to improve the known technical solutions to the effect that the necessary synchronization between the focusing lens and focus mark projection unit over a large focusing range is ensured in a simple manner and tolerances of the optical assemblies can be compensated.
  • the device consists of a, at least one focusing mark in the infrared spectral range on a surface projecting in the eye projection unit and a focusing, each of which is displaceable along the optical axis
  • the projection unit arranged in an illumination beam path and the focusing unit arranged in an observation beam path are displaced simultaneously or individually according to the corresponding specifications of an existing control unit by means of electronically controllable control elements.
  • the proposed technical solution can be used for ophthalmological devices in which test marks of a focusing aid projected via an illumination beam path and imaged via an observation beam path and in which different optical elements are used in the two beam paths.
  • the invention will be described in more detail below with reference to exemplary embodiments. Show this
  • Figure 1 the basic structure of a fundus camera with focusing and focus mark projection unit
  • the inventive focusing device for ophthalmological devices consists of one, at least one focusing mark in the infrared spectral region on a surface projecting in the eye projection unit and a focusing unit, which are each displaceable along the optical axis.
  • the projection unit in an illumination beam path and the focusing unit are arranged in an observation beam path and can be moved by electronically controllable control elements simultaneously or individually, according to the corresponding specifications of an existing control unit which has a memory.
  • Servo motors preferably stepper motors, are used as the electronically controllable control elements.
  • the focusing device can furthermore have an autofocus system for focusing the focusing mark in the infrared spectral range, a
  • FIG. 1 shows the basic structure of a fundus camera with the focusing device.
  • the focusing device for a fundus camera according to the "non-mydriatic" principle consists of one, a focusing mark 1 in the infrared spectral region on the fundus 2 projecting projection unit 3 and a focusing unit 4, each along the optical Axis 5 are displaced.
  • the displacement of projection unit 3 and focusing unit 4, which is preferably realized via stepper motors 6, can be carried out simultaneously or individually, according to the corresponding specifications of an existing control unit (not shown).
  • the fundus 2 is illuminated with infrared light for observation via various optical elements 8.
  • the infrared light reflected from the fundus 2 is imaged via different optical elements 8 and a folding mirror 9 on the viewfinder camera 10.
  • the fundus 2 is briefly illuminated with white light for image acquisition via a folding mirror 13 and various optical elements 8.
  • the white light reflected from the fundus 2 is imaged via different optical elements 8, with folded-up mirror 9 folded over on the documentation camera 11.
  • both units are adjusted by a respective stepper motor 6.
  • the necessary relationship between the adjustment paths or steps is stored as a table or function in the control unit.
  • FIG. 2 shows a possible relationship for the course of motion of projection unit 3 and focusing unit 4 in the case of a fundus camera according to FIG.
  • At least one focusing mark in the infrared spectral range is projected onto a surface in the eye from a projection unit arranged in an illumination beam path and is focused on a focusing unit arranged in the observation beam path Detector imaged.
  • the focusing operation is carried out by simultaneous displacement of the projection unit and the focusing unit in the direction of the optical axis by electronically controllable adjusting elements, according to the corresponding specifications of an existing control unit. Since different optical elements are used in the illumination and observation beam path, this results in a complicated, non-linear relationship between the necessary displacement of the projection unit and the focusing unit.
  • the simultaneous displacement of the projection unit and the focusing unit by the electronically controllable adjusting elements takes place according to the corresponding specifications of the control unit.
  • a corresponding table or function is stored in the existing memory of the control unit.
  • the simultaneous displacement of the projection unit and the focusing unit by the electronically controllable adjusting elements according to the corresponding specifications of the control unit can also be done automatically by an autofocus system after the ophthalmological device has been aligned with the patient. After the focus has been focused in the infrared spectral range by the simultaneous displacement of the projection unit and the focusing unit, only the focusing unit is moved along the optical axis with the change to the image recording mode (visible spectral range). From the control unit, the electronically controllable control element is controlled according to the stored specifications and reversed the shift after the image has been taken.
  • the focusing mark projected onto the fundus in the infrared spectral region is reflected in a deeper tissue layer than the white light used for imaging. While white light is reflected by the retina, infrared light penetrates through the retina and is first reflected by the underlying pigment epithelial layer. The focal planes of white and infrared light are thus separated by about 200 ⁇ m, which corresponds to the known average thickness of the retina. When changing to the image recording mode, this is corrected by moving the focusing unit by the corresponding value. In the present example, the focusing unit is shifted step by step by about 50 ⁇ m.
  • the displacements made by the electronically controllable elements preferably take place in defined steps.
  • the corresponding specifications for the displacement of the projection unit and of the focusing unit or of the focusing unit stored in the memory of the control unit are predetermined or recorded and stored with the aid of reference objects.
  • the movement patterns can be recorded point by point, for example.
  • the focusing mark is projected by the projection unit onto a catching plane whose sharp image is controlled by the viewfinder camera. liert and stored the position of the stepping motor in the presence of a sharp image.
  • the focusing mark which is focused on the catching plane, is imaged on the documentation camera via the focusing unit and the position of the stepping motor is stored in the case of a sharp image. This process is repeated often, for different diopter values. After taking a finite number of nodes (pairs of values) is done by means of compensation curve setting the remaining value pairs.
  • This point-by-point recording of the course of motion has the advantage that, in particular, device-specific tolerances of the optical assemblies can be taken into account and the courses of motion are precisely matched to the device.
  • the necessary synchronization between the projection unit and a focusing unit can be ensured in a simple manner. Not only can the paths of the adjustment paths over the entire focusing range be optimally adapted, but also the tolerances of the optical assemblies can be individually compensated from device to device in a simple manner.
  • Necessary changes of the focus plane which become necessary when switching between observation mode (in the infrared spectral range) and image recording mode (in the visible spectral range), can be realized simply by shifting the focusing unit during the switching process. After image acquisition, the control unit restores the focus state before taking the image.
  • the shift distances required for mode changes can also be stored in the form of a table.

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

L'invention concerne un procédé et un dispositif pour appareils ophtalmologiques servant à examiner le fond de l'oeil au moyen d'un système optique et de capteurs électroniques permettant d'acquérir des images. Le dispositif de focalisation selon l'invention est conçu selon le principe non mydriatique, et comprend au moins une unité de projection (3) qui projette une marque de focalisation (1) dans le domaine spectral infrarouge sur une surface dans l'oeil, et une unité de focalisation (4), ces unités pouvant respectivement être déplacées le long de l'axe optique (5). Le déplacement desdites unités est effectué au moyen d'éléments d'ajustement à commande électronique, de manière simultanée ou individuelle, en fonction des réglages correspondants d'une unité de commande existante. Cette invention garantit de manière simple la synchronisation nécessaire entre l'unité de projection et l'unité de focalisation, ce qui permet non seulement d'adapter de manière optimale les courses de réglage sur l'ensemble de la zone de focalisation, mais également de compenser de manière simple les tolérances des groupes optiques de chaque appareil.
EP06701013A 2005-01-21 2006-01-18 Dispositif de focalisation pour appareils ophtalmologiques, notamment pour cameras d'observation du fond de l'oeil, et son procede d'utilisation Withdrawn EP1838207A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005003440.3A DE102005003440B4 (de) 2005-01-21 2005-01-21 Fokussiervorrichtung für ophthalmologische Geräte, insbesondere Funduskameras und Verfahren zu dessen Verwendung
PCT/EP2006/000379 WO2006077078A1 (fr) 2005-01-21 2006-01-18 Dispositif de focalisation pour appareils ophtalmologiques, notamment pour cameras d'observation du fond de l'oeil, et son procede d'utilisation

Publications (1)

Publication Number Publication Date
EP1838207A1 true EP1838207A1 (fr) 2007-10-03

Family

ID=36010455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06701013A Withdrawn EP1838207A1 (fr) 2005-01-21 2006-01-18 Dispositif de focalisation pour appareils ophtalmologiques, notamment pour cameras d'observation du fond de l'oeil, et son procede d'utilisation

Country Status (5)

Country Link
US (1) US7753522B2 (fr)
EP (1) EP1838207A1 (fr)
JP (1) JP4898706B2 (fr)
DE (1) DE102005003440B4 (fr)
WO (1) WO2006077078A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007036683B4 (de) * 2007-08-03 2017-10-26 Carl Zeiss Meditec Ag Vorrichtung und Verfahren zur automatischen Fokussierung einer non-mydriatischen Funduskamera
JP5430260B2 (ja) * 2009-07-09 2014-02-26 キヤノン株式会社 眼科撮像装置および眼科撮像方法
FI20096190A (fi) * 2009-11-17 2011-05-18 Optomed Oy Tutkimuslaite
JP5554610B2 (ja) * 2010-03-31 2014-07-23 株式会社ニデック 眼底撮影装置
CN102885608B (zh) * 2011-07-21 2014-10-08 上海美沃精密仪器有限公司 一种眼部成像的系统
DE102012022058A1 (de) * 2012-11-08 2014-05-08 Carl Zeiss Meditec Ag Flexibles, multimodales Retina-Bildaufnahme- und Messsystem
JP5807701B2 (ja) * 2014-05-28 2015-11-10 株式会社ニデック 眼底撮影装置

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US4196979A (en) 1976-10-16 1980-04-08 Canon Kabushiki Kaisha Method and device for detecting distance between eye-examining instrument and eye
DE3001244A1 (de) * 1979-01-16 1980-07-24 Canon Kk Fokussierungssystem fuer eine augengrundkamera
DE3031822A1 (de) 1979-08-24 1981-03-12 Canon K.K., Tokyo Augenuntersuchungsgeraet.
DE3116380A1 (de) 1980-04-25 1982-02-25 Canon K.K., Tokyo "augenhintergrund-kamera mit automatischer scharfeinstellung"
JPS56151929A (en) 1980-04-25 1981-11-25 Canon Inc Fundus camera
JPS59151935A (ja) 1983-02-18 1984-08-30 株式会社トプコン 眼底カメラ
DE3617421A1 (de) * 1986-04-30 1987-11-05 Leitz Ernst Gmbh Optisches bauelement und vorrichtung zu dessen verwendung
JP2738849B2 (ja) * 1988-10-06 1998-04-08 株式会社トプコン 眼科検査装置
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JPH07313466A (ja) * 1994-05-20 1995-12-05 Nikon Corp 眼科撮影装置
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Also Published As

Publication number Publication date
JP2008528078A (ja) 2008-07-31
JP4898706B2 (ja) 2012-03-21
DE102005003440B4 (de) 2020-01-02
US20080030681A1 (en) 2008-02-07
DE102005003440A1 (de) 2006-07-27
WO2006077078A1 (fr) 2006-07-27
US7753522B2 (en) 2010-07-13

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