DE3621983A1 - Ophthalmological examination apparatus for measuring topographic data of the eye fundus - Google Patents
Ophthalmological examination apparatus for measuring topographic data of the eye fundusInfo
- Publication number
- DE3621983A1 DE3621983A1 DE19863621983 DE3621983A DE3621983A1 DE 3621983 A1 DE3621983 A1 DE 3621983A1 DE 19863621983 DE19863621983 DE 19863621983 DE 3621983 A DE3621983 A DE 3621983A DE 3621983 A1 DE3621983 A1 DE 3621983A1
- Authority
- DE
- Germany
- Prior art keywords
- examination apparatus
- eye fundus
- topographic data
- laser
- ophthalmological examination
- 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- Withdrawn
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
- A61B3/1225—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 using coherent radiation
Abstract
Description
Die Erfindung bezieht sich auf ein ophthalmologisches Unter suchungsgerät, das erlaubt, topografische Daten (Entfernung und Höhendifferenzen) am Augenhintergrund mit Hilfe von Laserinterferenzstreifen auszumessen. Die Maxwellsche Abbil dung garantiert dabei, daß die Abbildungsqualität der optischen Medien des zu untersuchenden Auges keinen Einfluß auf die Streifenentstehung nimmt. Aufgrund der Verwendung von Vielfachinterferenz entstehen Streifen hohen Kontrastes und der Bereich des Laserspecklings wird stark eingeengt. Die verbleibende Specklestruktur innerhalb der Streifen wird durch das Blitzlicht der Funduskamera in ihrem Kontrast weiter reduziert, so daß sie bei der Ausmessung nicht mehr störend in Erscheinung tritt. Zur Vermeidung von Reflexen in der Fundusaufnahme wird das Laserlicht in den Beleuchtungs strahlengang der Funduskamera eingekoppelt. The invention relates to an ophthalmic sub Search device that allows topographic data (distance and height differences) at the fundus with the help of Measure laser interference fringes. The Maxwellian diagram This guarantees that the image quality of the optical media of the eye to be examined has no influence on the streak formation. Because of the use Multiple interference creates stripes of high contrast and the area of the laser bacon is severely restricted. The remaining speckle structure inside the streak will by the flash of the fundus camera in its contrast further reduced so that they no longer measure is disruptive. To avoid reflections in the fundus image is the laser light in the lighting beam path of the fundus camera coupled.
In Fig. 1 dient als Laserlichtquelle ein Helium-Neon Laser. Der nachfolgende elektronische Zentralverschluß ZV steuert die Länge des Laserimpulses zwischen 30s und 1/500s. Der von der Laserlichtquelle ausgehende Laserlichtstrahl wird durch die Linse L 1, die eine Brennweite von etwa 25mm besitzt, auf die Glasplatte G fokussiert. Durch Vielfach reflexion an der planparallelen Glasplatte G, die auf beiden Seiten zu etwa 90% teilverspiegelt ist, entstehen mehrere interferenzfähige Laserstrahlen annähernd gleicher Inten sität, die über die justierbaren Spiegel U 1 und U 2 umgelenkt werden. Die Linsen L 2 und L 3 mit Brennweiten von etwa 40mm und 60mm sowie die Umlenkspiegel U 3, U 4 und U 5 bilden die bei der Platte G befindlichen Laserstrahlenfoki über die Funduskamera weiter in die Pupillenebene des zu untersuchen den Auges ab. Die Blende BL dient zur Regulierung des Winkels, unter dem das Laserstrahlenbündel vom Patienten gesehen wird.In Fig. 1, a helium-neon laser serves as the laser light source. The subsequent electronic central shutter ZV controls the length of the laser pulse between 30s and 1 / 500s. The laser light beam emanating from the laser light source is focused on the glass plate G by the lens L 1 , which has a focal length of approximately 25 mm. By multiple reflection on the plane-parallel glass plate G , which is partially mirrored on both sides to about 90%, several interference-capable laser beams of approximately the same intensity arise, which are deflected via the adjustable mirrors U 1 and U 2 . The lenses L 2 and L 3 with focal lengths of approximately 40 mm and 60 mm and the deflection mirrors U 3 , U 4 and U 5 image the laser beam foci located on the plate G further via the fundus camera into the pupil plane of the eye to be examined. The aperture BL serves to regulate the angle at which the laser beam is seen by the patient.
Die Justierung des Interferometers erfolgt zum einen durch eine Verschiebung der Linse L 3, mit der die Position der Fokussierungsebene des Laserstrahlenbündels im unter suchten Auge verändert werden kann. Zum anderen wird über den Winkel R der Glasplatte G zur optischen Achse des Augenuntersuchungsgerätes die relative Phasenverschiebung der einzelnen Teilwellen des Laserstrahlenbündels zueinander beeinflußt. Die Phasenverschiebung muß in der mit E bezeich neten Ebene vor der Linse L 2, die konjugiert zur Netzhaut des untersuchten Auges ist, ein ganzzahliges Vielfaches von 2µ betragen.The adjustment of the interferometer takes place on the one hand by shifting the lens L 3 , with which the position of the focusing plane of the laser beam in the examined eye can be changed. On the other hand, the relative phase shift of the individual partial waves of the laser beam is influenced by the angle R of the glass plate G to the optical axis of the eye examination device. The phase shift must be an integer multiple of 2µ in the plane labeled E in front of the lens L 2 , which is conjugated to the retina of the examined eye.
Fig. 2 zeigt den Beleuchtungsstrahlengang der modifizier ten Funduskamera, der aus den Doppelkondensoren DK 1 und DK 2, dem Umlenkspiegel LS mit zentralem Loch zur Auskoppelung des Abbildungsstrahlenganges und der Frontlinse A besteht. Als Einstellicht dient eine Halogenlampe L, zur Filmbelichtung wird ein Blitzlicht B verwendet. Der Abbildungsstrahlengang besteht aus Patientenauge E, Frontlinse A, Lochspiegel LS, Kameraobjektiv K und dem Film F. Fig. 2 shows the illuminating beam path of the modified fundus camera, which consists of the double condensers DK 1 and DK 2 , the deflecting mirror LS with a central hole for decoupling the imaging beam path and the front lens A. A halogen lamp L serves as modeling light, and a flash light B is used for film exposure. The imaging beam path consists of patient eye E , front lens A , perforated mirror LS , camera lens K and the film F.
Das Interferometer wird an der mit C bezeichneten Position über eine Strahlteilerplatte ST in den Beleuch tungsstrahlengang eingespiegelt.The interferometer is reflected at the position labeled C via a beam splitter plate ST in the lighting beam path.
Fig. 3 zeigt die Strahlteilerplatte ST sowie den Verlauf des Laserstrahlenbündels innerhalb der Kamera. Wegen des zentralen Lochs im Umlenkspiegel LS werden die Laserstrahlen nicht symmetrisch zur gemeinsamen optischen Achse von Kamera und untersuchtem Auge eingestrahlt. Fig. 3 shows the beam splitter plate ST and the course of the laser beam within the camera. Because of the central hole in the deflecting mirror LS , the laser beams are not radiated symmetrically to the common optical axis of the camera and the examined eye.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863621983 DE3621983A1 (en) | 1986-07-01 | 1986-07-01 | Ophthalmological examination apparatus for measuring topographic data of the eye fundus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863621983 DE3621983A1 (en) | 1986-07-01 | 1986-07-01 | Ophthalmological examination apparatus for measuring topographic data of the eye fundus |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3621983A1 true DE3621983A1 (en) | 1988-01-14 |
Family
ID=6304103
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19863621983 Withdrawn DE3621983A1 (en) | 1986-07-01 | 1986-07-01 | Ophthalmological examination apparatus for measuring topographic data of the eye fundus |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3621983A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992003088A1 (en) * | 1990-08-17 | 1992-03-05 | Peters Daniel R | System and method for projecting an image onto the retina |
WO1998013665A1 (en) * | 1996-09-27 | 1998-04-02 | Eberhard-Karls-Universität Tübingen | Process and device for measuring a bump on a surface, in particular on the retina of the eye |
WO2007000276A1 (en) | 2005-06-29 | 2007-01-04 | Carl Zeiss Meditec Ag | Imaging unit for ophthalmological devices, in particular, for fundus cameras and method for the use thereof |
DE102007047460A1 (en) * | 2007-09-28 | 2009-04-09 | Carl Zeiss Meditec Ag | Apparatus and method for examining the ocular fundus, in particular the photoreceptors |
-
1986
- 1986-07-01 DE DE19863621983 patent/DE3621983A1/en not_active Withdrawn
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992003088A1 (en) * | 1990-08-17 | 1992-03-05 | Peters Daniel R | System and method for projecting an image onto the retina |
AU657918B2 (en) * | 1990-08-17 | 1995-03-30 | Daniel R. Peters | System and method for projecting an image onto the retina |
WO1998013665A1 (en) * | 1996-09-27 | 1998-04-02 | Eberhard-Karls-Universität Tübingen | Process and device for measuring a bump on a surface, in particular on the retina of the eye |
WO2007000276A1 (en) | 2005-06-29 | 2007-01-04 | Carl Zeiss Meditec Ag | Imaging unit for ophthalmological devices, in particular, for fundus cameras and method for the use thereof |
DE102005030228A1 (en) * | 2005-06-29 | 2007-01-18 | Carl Zeiss Meditec Ag | Imaging unit for ophthalmic devices, in particular fundus cameras and method for its use |
US7802885B2 (en) | 2005-06-29 | 2010-09-28 | Carl Zeiss Meditec Ag | Imaging unit for ophthalmological devices, in particular, for fundus cameras and method for the use thereof |
DE102007047460A1 (en) * | 2007-09-28 | 2009-04-09 | Carl Zeiss Meditec Ag | Apparatus and method for examining the ocular fundus, in particular the photoreceptors |
US8567948B2 (en) | 2007-09-28 | 2013-10-29 | Carl Zeiss Meditec Ag | Device and method for examining the eye fundus, especially the photoreceptors |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8139 | Disposal/non-payment of the annual fee |