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EP1838208A1 - Unite et procede de guidage interne du regard dans des cameras d'observation du fond de l'oeil - Google Patents

Unite et procede de guidage interne du regard dans des cameras d'observation du fond de l'oeil

Info

Publication number
EP1838208A1
EP1838208A1 EP06701506A EP06701506A EP1838208A1 EP 1838208 A1 EP1838208 A1 EP 1838208A1 EP 06701506 A EP06701506 A EP 06701506A EP 06701506 A EP06701506 A EP 06701506A EP 1838208 A1 EP1838208 A1 EP 1838208A1
Authority
EP
European Patent Office
Prior art keywords
fundus
beam path
control unit
fixation mark
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Withdrawn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
EP06701506A
Other languages
German (de)
English (en)
Inventor
Frank Teige
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 EP1838208A1 publication Critical patent/EP1838208A1/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Withdrawn legal-status Critical Current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
    • A61B3/12—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
    • 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

  • the present invention relates to an opto-electronic unit for viewing the patient during the examination or documentation of the ocular fundus.
  • the device which is preferably provided for fundus cameras, the diagnosis of diseases of the ocular fundus can be facilitated by the fact that the documented images are more precisely reproducible and thus more accurately comparable. In particular, disease progressions can be better tracked and presented in this way.
  • the gaze guidance is effected by external or internal fixing lights.
  • an optically generated fixation point is offered to the patient, which is reflected in different ways in the observation beam path and thus made visible to the patient, this fixation is generated in different ways.
  • the relatively coarse structured LCDs are operated in the "L-ZERO" regime, and the use of transmitted light with or without backlighting or in incident light limits the variability of the fixation markers, so that LCDs are neither multicolored nor graphic possible as a fixation mark.
  • the present invention has for its object to overcome these disadvantages of the known prior art and to develop a solution in which at any time reproducible a particular fixation or a particular Fixierhuimuster can be generated with a predetermined position with sufficient positioning accuracy.
  • a fixation mark generated by a surface light modulator is imaged onto the ocular fundus via an imaging optic, a mirrored mirror arranged in an observation beam path and a folding mirror arranged in a documentation beam path, wherein the positioning of the fixation mark is achieved via an actuation element which via a control unit is connected to the area light modulator takes place.
  • the proposed technical solution is particularly applicable in fundus cameras, where generated for internal vision fixation marks and positioned accordingly.
  • fundus cameras where generated for internal vision fixation marks and positioned accordingly.
  • the use but also in other ophthalmic devices conceivable.
  • Figure 1 the basic structure of a fundus camera with the internal fixation device according to the invention
  • Figure 2 the transmission behavior of the dichroic mirror used.
  • a surface light modulator for generating the fixation mark is present, which has imaging optics from which the fixation mark shown is imaged onto the ocular fundus via a partially transmissive mirror arranged in an observation beam path and a folding mirror arranged in a documentation beam path , wherein the area light modulator is connected via a control unit with an actuating element for positioning the fixing mark.
  • FIG. 1 shows the basic structure of a fundus camera with the internal fixing device according to the invention.
  • a surface light modulator in the form of a high-resolution graphic LCD 1 for generating the Fixiermarke 2 which has an imaging optics 3, of which the Fixiermarke shown 2 via a arranged in an observation beam 4 partially transparent, preferably dichroic mirror 5, one in a documentation beam 6th arranged folding mirror 7 and various optical elements on the eye fundus 8 is displayed.
  • the surface light modulator 1 is connected via a control unit 9 with an actuating element 10 for positioning the fixing mark 2.
  • LCDs liquid crystal display
  • LCOS liquid crystal on silicon
  • LED light emitting diode
  • O-LED organic light emitting diode
  • DMD digital micromirror device
  • the dichroic mirror 5 arranged in the observation beam path 4 has the advantage that the light yield is as large as possible and the load on the patient is kept as low as possible.
  • FIG. 2 shows the transmission behavior of a dichroic mirror 5 to be used.
  • the infrared light emitted for the observation of the light source 12 arranged in the illumination beam path 11 is focused on the eye fundus 8 via various optical components, reflected by the latter and imaged onto the CCD finder camera 13 via the folding mirror 7 and the dichroic mirror 5.
  • the entire infrared illumination light is imaged onto the CCD viewfinder camera 13, while the fixation mark projected onto the eye fundus 8 and located in the visible spectral range is reflected.
  • the visible light emanating from the flash light source 16 arranged in the illumination beam path 11 is focused on the eye fundus 8 via various optical components, reflected by the latter and imaged onto the CCD documentation camera 17 when the folding mirror 7 is not located in the documentation beam path 6.
  • a PC is preferably used as the control unit 9, the keyboard 14, a mouse, a trackball, a joystick or the like is accordingly used as an actuating element 10 for positioning the fixation mark 2 and via a parallel, serial, USB or FireWire interface connected to the PC. Also advantageous is the use of an additional monitor 15 for displaying the fundus image imaged in the observation beam path 4.
  • the corresponding fundus image also the data of the corresponding fixation mark, such as shape, color, intensity, coordinates u. a. save with. Activation of this stored fixation mark ensures that the patient will look in the same direction at a later time and thus examine and / or document the same fundus area. By superimposing the temporally successive images, changes are immediately visible.
  • a fixation mark 2 generated by a surface light modulator in the form of a high-resolution graphics-capable LCD 1 is applied to the ocular fundus via an imaging optic 3, a partially transmissive mirror 5 arranged in an observation beam path 4 and a folding mirror 7 arranged in a documentation beam path 6 8 and is thus visible to the patient.
  • the positioning of the Fixiermarke 2 takes place via a Actuator 10, which is connected via a control unit 9 with the surface light modulator 1.
  • control unit 9 is preferably a PC, it is obvious that a mouse, a trackball, a joystick or the like is used as the actuating element 10, which is connected to the PC via a parallel, serial, USB or FireWire interface.
  • the PC serving as control unit 9 additionally has a keyboard 14 for operation and a monitor 15 for displaying the fundus image imaged in the observation beam path 4.
  • the position or the movement of the positioned by means of the actuating element 10 and focused on the fundus 8 fixating 1 together with the image of the fundus on a is represented with the control unit 9 connected "Monitor 15 °.
  • FIG. 2 shows the transmission behavior of a dichroic mirror 5 to be used.
  • the infrared light emitted for the observation of the light source 12 arranged in the illumination beam path 11 is focused on the eye fundus 8 via various optical components, reflected by the latter and imaged onto the CCD finder camera 13 via the folding mirror 7 and the dichroic mirror 5.
  • the entire infrared illumination light is imaged onto the CCD viewfinder camera 13, while the fixation mark reflected by the eye fundus 8 lies in the visible spectral range and is therefore reflected by the dichroic mirror 5 and not shown in the viewfinder image.
  • the folding mirror 7 is swung out of the documentation beam path 6.
  • the visible light emitted by the flashlamp 16 arranged in the illumination beam path 11 is focused on the eye fundus 8 via various optical components, reflected by the latter and imaged onto a CCD documentation camera 17.
  • the internal fixation mark 1 is not shown on the recording.
  • the corresponding fixation mark such as shape, color, intensity, coordinates, among other things. Activation of this stored fixation mark ensures that the patient will look in the same direction at a later time and thus examine and / or document the same fundus area. By superimposing the temporally successive images, changes are immediately visible.For a correct assessment of disease progression, it is necessary to obtain images and image sections of exactly the same fundus area and to bring these into coincidence.
  • the position of the fixation mark can be entered simply and directly, either by entering the corresponding coordinates via the keyboard, or the fixation point is determined interactively, while observing the patient fundus, by the examiner with a mouse click.
  • the coordinates of the fixing point can be read out of the stored data of the previous recording and then entered manually or transferred directly from this recording by pressing a button.
  • the accuracy of the viewing direction is essentially determined by the size of the fixation mark and / or the fineness of its structures.
  • the accuracy of the viewing direction is very important for the reproducibility of recordings.
  • the fixation can be designed as a single point or for low-vision patients over a large area and thus better recognizable for this group of patients. It is also possible to vary the color of the fixation mark shown. For the sighting of toddlers, it is even possible to create colored, child-friendly fixation marks where certain details of the fixation can be named as "target point", so that here too an exact and reproducible directional control, to obtain the "congruent" images are guaranteed can.
  • the generated internal fixation mark is realized by the high-resolution graphics-capable display with sufficient number of pixels that software-based controls any point of the display or groups of points can be activated.
  • a significant advantage of the type of vision control according to the invention is that the reproducibility of digital images is significantly improved with this method, since the fixation mark can be generated pixel-precise, ie in the micrometer range, again.
  • the fixation mark can be generated pixel-precise, ie in the micrometer range, again.
  • one or more images of the fundus, which were taken at a time interval can be brought exactly to cover.
  • image manipulation it is thus easily possible temporal changes, d. H. Disease courses, much more clearly visible.
  • image processing procedures such as differential image or false color representation, the diagnosis and description of disease processes is significantly simplified.
  • the unit according to the invention and the method according to the invention for internal gaze guidance in fundus cameras can also be used in weak-sighted patients, since it is easily possible to produce fixing marks of different sizes.
  • the fixation mark is enlarged by a mouse click until it is visible to the patient.
  • either the coordinates of all "subpoints" involved in the fixation mark can be stored or, in addition to the coordinates of the central "subpoint", the necessary data and information required for the reproducibility of the specific fixation point in shape and size are additionally stored.

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 une unité optoélectronique servant à guider le regard du patient pendant l'examen ou la documentation du fond de l'oeil. Cette unité de guidage interne du regard dans des caméras d'observation du fond de l'oeil comprend un modulateur de lumière de surface (1) qui est conçu pour générer une marque de fixation (2), et qui comporte un système optique de reproduction (3) destiné à reproduire la marque de fixation générée (2), sur le fond de l'oeil (8), par l'intermédiaire d'un miroir partiellement transparent (5) qui est disposé sur une trajectoire de faisceau d'observation (4), et d'un miroir rabattant (7) qui est disposé sur une trajectoire de faisceau de documentation (6), le modulateur de lumière de surface (1) étant relié avec un élément d'actionnement (10) pour positionner la marque de fixation (1) par l'intermédiaire d'une unité de commande (9). Le dispositif selon l'invention, qui est de préférence conçu pour les caméras d'observation du fond de l'oeil, permet de faciliter le diagnostic de maladies du fond de l'oeil, les prises de vue documentées pouvant être reproduites avec plus de précision, et par conséquent comparées avec plus de précision. Cette invention permet notamment de mieux suivre et représenter l'évolution de maladies.
EP06701506A 2005-01-21 2006-01-18 Unite et procede de guidage interne du regard dans des cameras d'observation du fond de l'oeil Withdrawn EP1838208A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005003443A DE102005003443A1 (de) 2005-01-21 2005-01-21 Einheit und Verfahren zur internen Blickführung in Funduskameras
PCT/EP2006/000380 WO2006077079A1 (fr) 2005-01-21 2006-01-18 Unite et procede de guidage interne du regard dans des cameras d'observation du fond de l'oeil

Publications (1)

Publication Number Publication Date
EP1838208A1 true EP1838208A1 (fr) 2007-10-03

Family

ID=36096094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06701506A Withdrawn EP1838208A1 (fr) 2005-01-21 2006-01-18 Unite et procede de guidage interne du regard dans des cameras d'observation du fond de l'oeil

Country Status (5)

Country Link
US (1) US20090096986A1 (fr)
EP (1) EP1838208A1 (fr)
JP (1) JP2008528079A (fr)
DE (1) DE102005003443A1 (fr)
WO (1) WO2006077079A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007023270A1 (de) * 2007-05-18 2008-11-20 Linos Photonics Gmbh & Co. Kg Funduskamera
DE102009007732A1 (de) 2009-02-05 2010-08-12 Carl Zeiss Meditec Ag Anordnung zur Darstellung einer Fixiermarke für ophthalmologische Untersuchungs- und/oder Behandlungsgeräte
DE102010017837A1 (de) 2010-04-22 2011-10-27 Carl Zeiss Meditec Ag Anordnung zur Erzielung hochgenauer Messwerte am Auge
FI125445B (fi) * 2012-09-12 2015-10-15 Trividi Oy Katseenohjausjärjestely
DE102013005869B4 (de) * 2013-04-08 2016-08-18 Friedrich-Alexander-Universität Erlangen-Nürnberg Patientenführungsmodul

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2843287A1 (de) * 1977-10-05 1979-04-19 Canon Kk Augenuntersuchungsinstrument
JPS598933A (ja) * 1982-07-07 1984-01-18 キヤノン株式会社 視標を具えた眼科機械
JPS635725A (ja) * 1986-06-26 1988-01-11 興和株式会社 眼底検査装置
JPH01170438A (ja) * 1987-12-25 1989-07-05 Canon Inc 眼底画像合成装置
JPH09271464A (ja) * 1996-04-05 1997-10-21 Canon Inc 眼科装置
JP3592050B2 (ja) * 1997-10-03 2004-11-24 キヤノン株式会社 眼科装置
JPH11225969A (ja) * 1998-02-13 1999-08-24 Canon Inc 眼底カメラ
JPH11235317A (ja) * 1998-02-20 1999-08-31 Canon Inc 眼科装置
JP3718098B2 (ja) * 2000-03-22 2005-11-16 株式会社ニデック 眼底カメラ
JP2002224038A (ja) * 2001-01-31 2002-08-13 Nidek Co Ltd 眼底カメラ
JP3929721B2 (ja) * 2001-05-25 2007-06-13 株式会社ニデック 眼底カメラ
US6669341B2 (en) * 2001-08-31 2003-12-30 Metrologic Instruments, Inc. Ophthalmic instrument having wavefront sensor with multiple imaging devices that simultaneously capture multiple images of an array of spots produced by a lenslet array
JP2003126043A (ja) * 2001-10-22 2003-05-07 Canon Inc 眼科撮影装置
JP2004024470A (ja) * 2002-06-25 2004-01-29 Canon Inc 眼科撮影装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006077079A1 *

Also Published As

Publication number Publication date
US20090096986A1 (en) 2009-04-16
JP2008528079A (ja) 2008-07-31
DE102005003443A1 (de) 2006-07-27
WO2006077079A1 (fr) 2006-07-27

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