DE1076397B - Retinal camera with compensation device - Google Patents
Retinal camera with compensation deviceInfo
- Publication number
- DE1076397B DE1076397B DEZ5091A DEZ0005091A DE1076397B DE 1076397 B DE1076397 B DE 1076397B DE Z5091 A DEZ5091 A DE Z5091A DE Z0005091 A DEZ0005091 A DE Z0005091A DE 1076397 B DE1076397 B DE 1076397B
- Authority
- DE
- Germany
- Prior art keywords
- retinal camera
- optical axis
- lenses
- another
- lens
- 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.)
- Pending
Links
- 230000002207 retinal effect Effects 0.000 title claims description 7
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims 1
- 230000000295 complement effect Effects 0.000 claims 1
- 210000001525 retina Anatomy 0.000 description 4
- 238000005286 illumination Methods 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
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
- A61B3/103—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining refraction, e.g. refractometers, skiascopes
- A61B3/1035—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining refraction, e.g. refractometers, skiascopes for measuring astigmatism
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)
Description
DEUTSCHESGERMAN
Die Erfindung betrifft eine Netzhautkamera mit einem aus mehreren Linsen bestehenden optischen System, das für die photographische Darstellung eines normalen Auges astigmatisch korrigiert und auf der Rückseite des Beleuchtungsspiegels angeordnet ist.The invention relates to a retinal camera with an optical system consisting of several lenses System that corrects astigmatically for the photographic representation of a normal eye and is based on the Rear of the lighting mirror is arranged.
Bei der Beobachtung oder photographischen Darstellung der Grenzgebiete der Netzhaut unter schräger ßlickrichtung tritt eine starke astigmatische Verzeichnung des Bildes ein. Die Anwendung der bekannten Netzhautkameras ist daher auf den mit nahezu senkrechter Blickrichtung erfaßbaren Teil der Netzhaut beschränkt.When observing or photographing the border areas of the retina under oblique In the direction of view there is a strong astigmatic distortion of the image. The application of the known Retinal cameras are therefore on the part of the retina that can be detected with an almost vertical viewing direction limited.
Erfindungsgemäß wird innerhalb des Objektivs nahe der Aperturblende eine aus einem sammelnden und einem zerstreuenden Element bestehende Zylinderlinsenkombination angeordnet, deren um die optische Achse relativ zueinander verdrehbaren Elemente bei parallel stehenden Zylinderachsen einander zu einer planparallelen Platte ergänzen. Zweckmäßig sind die beiden Zylinderlinsen mittels eines Differentialgetriebes relativ zueinander und mit dem Getriebe zusammen um die optische Achse drehbar gelagert. Mit einer solchen Anordnung läßt sich in universeller Weise nicht nur jede astigmatische Verzeichnung bei der Darstellung schwer zugänglicher Grenzgebiete der Netzhaut aufheben, sondern man hat auch, wie bei gewissen ophthalmologischen Untersuchungsgeräten, die Möglichkeit einer verzeichnungsfreien Abbildung eines überhaupt astigmatischen Auges sowie auch eines nicht mit astigmatischern Fehler behafteten Auges.According to the invention, within the objective close to the aperture stop, one of a convergent and a diffusing element arranged cylinder lens combination, whose around the optical Axis relative to one another rotatable elements with parallel cylinder axes to one another add plane-parallel plate. The two cylinder lenses are expedient by means of a differential gear mounted rotatably about the optical axis relative to each other and together with the gear. With Not only any astigmatic distortion can be added to such an arrangement in a universal manner the representation of hard-to-reach border areas of the retina, but one also has, as with certain ophthalmological examination devices, the possibility of distortion-free imaging an eye that is astigmatic at all and also an eye that is not afflicted with astigmatic defects.
Die Ausschaltung des Astigmatismus des Auges bei der Refraktionsbestimmung oder bei ophthalmologischen Untersuchungen mit durch ein Kegelradgetriebe gegeneinander verdrehbaren zylindrischen Gläsern ist bekannt. Dabei tritt im allgemeinen eine zusätzliche sphärische Komponente in Erscheinung, welche in geeigneter Weise kompensiert werden muß. Hierzu bedarf es verhältnismäßig aufwändiger Mittel. So ist es z.B. bekannt, die erforderliche Kompensation durch Veränderung des Abstandes einer Folge von sammelnden und zerstreuenden sphärischen Linsenflächen zu erzielen. Infolge der nichtlinearen Beziehungen bedarf es hierzu einer zu errechnenden Kurvensteuerung.The elimination of the astigmatism of the eye in the refraction determination or in ophthalmological Investigations with cylindrical glasses that can be rotated against each other by a bevel gear known. In general, an additional spherical component appears, which is more suitable Way must be compensated. This requires relatively expensive resources. So is For example, it is known to make the necessary compensation by changing the spacing of a sequence of collecting and diffusing spherical lens surfaces. As a result of the non-linear relationships there is a curve control to be calculated for this purpose.
Bei der Einrichtung nach der Erfindung entfällt die Notwendigkeit axial verschieblicher und in ihrem Abstand veränderlicher sphärischer Kompensationsdemente überhaupt. Bei Veränderungen der relativen /Xchsenlage der Zylinderglieder bedarf es lediglich einer auf der Mattscheibe leicht einzustellenden Nachfokussierung der Netzhautkamera.In the device according to the invention, there is no need for axially displaceable and in their Distance between variable spherical compensation elements at all. When the relative The axis position of the cylinder links is only required a refocusing of the retinal camera that is easy to adjust on the screen.
Im folgenden wird die Erfindung an Hand der schematischen Abbildung, welche das optische System eines solchen Gerätes veranschaulicht, näher erläutert:In the following the invention is based on the schematic illustration, which the optical system of such a device is illustrated and explained in more detail:
Von der Beleuchtungseinrichtung 1 fällt Licht über Netzhautkamera
mit Kompensations-VorrichtungLight falls from the lighting device 1 via a retinal camera
with compensation device
Anmelder:
Fa. Carl Zeiss, Heidenheim/BrenzApplicant:
Carl Zeiss, Heidenheim / Brenz
Dr. Hans Littmann, Heidenheim/Brenz,
ist als Erfinder genannt wordenDr. Hans Littmann, Heidenheim / Brenz,
has been named as the inventor
den Beleuohtungsspiegel 2 und die Sammellinse 3 in das Auge 4. Das von der Netzhaut 5 reflektierte Licht tritt wieder durch die Linse 3. Diese erzeugt das Zwischenbild 6. Die Linse 3 ist so beschaffen, daß der Radius ihrer vorderen, dem Auge zugewandten Fläche doppelt so groß ist wie die Dicke der Linse. Dadurch wird das von dieser Fläche reflektierte Licht in der hinteren Fläche dieser Linse, welche konzentrisch zu dem Beobachtungsloch des Beleuchtungsspiegels 2 liegt, vereinigt, und kann durch eine dort angebrachte Zentralblende ausgeschaltet werden. Das Zwischenbild 6 wird durch das hinter dem Beleuchtungsspiegel angeordnete, aus den Linsen 7 und 8 bestehende Objektiv in die Bildebene 9 abgebildet. Zwischen den Linsen 7 und 8 ist in der Nähe der Aperturblende die Zylinderlinsenkombination 10 angeordnet, welche aus der sammelnden Zylinderlinse 11 und der streuenden Zylinderlinse 12 besteht. Die Zylinderlinsen 11 und 12 können mittels eines Getriebes 13 gegeneinander verdreht werden. Es ist ferner möglich, die ganze Zylinderlinsenkombination 10 mittels des Hebels 14 um den Zentralstrahl zu drehen.the illumination mirror 2 and the converging lens 3 in the eye 4. The light reflected by the retina 5 again passes through the lens 3. This produces the intermediate image 6. The lens 3 is designed so that the radius of its front surface facing the eye twice the thickness of the lens. This causes the light reflected from this surface in the rear surface of this lens, which is concentric to the observation hole of the illumination mirror 2 lies, united, and can be switched off by a central screen attached there. The intermediate image 6 is through the lens, which is arranged behind the illumination mirror and consists of lenses 7 and 8 mapped in the image plane 9. Between the lenses 7 and 8 is in the vicinity of the aperture diaphragm Cylinder lens combination 10 arranged, which consists of the collecting cylinder lens 11 and the scattering Cylindrical lens 12 is made. The cylinder lenses 11 and 12 can be rotated relative to one another by means of a gear 13 will. It is also possible to move the entire cylinder lens combination 10 by means of the lever 14 to rotate the central beam.
Claims (2)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEZ5091A DE1076397B (en) | 1955-08-18 | 1955-08-18 | Retinal camera with compensation device |
| FR1155410D FR1155410A (en) | 1955-08-18 | 1956-08-06 | Ocular diagnostic device, in particular retinograph with compensation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEZ5091A DE1076397B (en) | 1955-08-18 | 1955-08-18 | Retinal camera with compensation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1076397B true DE1076397B (en) | 1960-02-25 |
Family
ID=7619339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEZ5091A Pending DE1076397B (en) | 1955-08-18 | 1955-08-18 | Retinal camera with compensation device |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1076397B (en) |
| FR (1) | FR1155410A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1289664B (en) * | 1967-07-15 | 1969-02-20 | Rodenstock Optik G | Ophthalmometer |
| DE19614750A1 (en) * | 1996-04-16 | 1997-10-23 | Zeiss Carl Jena Gmbh | Astigmatism compensation camera |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE814668C (en) * | 1950-03-11 | 1951-09-24 | Rodenstock Optik G | Device for measuring or compensating for the astigmatism of the human eye |
-
1955
- 1955-08-18 DE DEZ5091A patent/DE1076397B/en active Pending
-
1956
- 1956-08-06 FR FR1155410D patent/FR1155410A/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE814668C (en) * | 1950-03-11 | 1951-09-24 | Rodenstock Optik G | Device for measuring or compensating for the astigmatism of the human eye |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1289664B (en) * | 1967-07-15 | 1969-02-20 | Rodenstock Optik G | Ophthalmometer |
| DE19614750A1 (en) * | 1996-04-16 | 1997-10-23 | Zeiss Carl Jena Gmbh | Astigmatism compensation camera |
| DE19614750C2 (en) * | 1996-04-16 | 2003-10-09 | Zeiss Carl Jena Gmbh | Device for astigmatism compensation on a fundus camera |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1155410A (en) | 1958-04-28 |
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