Stereoscopic retinal camera with focus detection system

Details Stereoscopic retinal camera with focus detection system Stereoscopic retinal camera with focus detection system

1993-07-23

1995-01-17

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, 351221, 354 62, A61B 314, A61B 104

Patent

active

053829883

ABSTRACT:
A stereoscopic retinal camera is provided with an illumination optical system for illuminating the fundus of an examinee's eye, an observing/photographing optical system for observing and photographing an image of the fundus of the eye in a stereoscopic picture, which includes a light beam splitting optical system for splitting the light beam of the illumination optical system reflected by the fundus into a right light beam and a left light beam and a pair of image forming optical systems for forming respective images of the fundus by the two light beams, an index projecting optical system for projecting a focusing index on the examinee's eye, an index detecting optical system for detecting the focusing condition of the focusing index projected on the fundus of the eye, a judging means for judging a focusing condition by processing signals provided by the index detecting optical system, wherein one of the index projecting optical system and the index detecting optical system comprises a pair of right and left optical systems, which are disposed on each light path branched from light paths of the image forming optical systems, and use a part of the light path of the image forming optical system in common with a reflecting mirror for reflecting the images of the index.

REFERENCES:
patent: 4436388 (1984-03-01), Takahashi et al.
patent: 4452517 (1984-06-01), Kohayakawa
patent: 5120122 (1992-06-01), McAdams
patent: 5255026 (1993-10-01), Arai et al.

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