Stereoscopic retinal camera

Details Stereoscopic retinal camera Stereoscopic retinal camera

1992-09-21

1994-12-06

Bertsch, Richard A.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, 351221, A61B 314

Patent

active

053715578

ABSTRACT:
A stereoscopic retinal camera comprises an illuminating optical system, a photographing optical system, an observation optical system and a focus detection optical system. The focusing optical system consists of an index projecting system combined with one of the two light paths of the observation optical system, and an index detecting system combined with the other light path of the observation optical system. The respective positions of the focusing lenses of the photographing optical system are adjusted so that a sharp image of the focusing index is detected by the index detecting system. Thus, the stereoscopic retinal camera can be easily focused without requiring any particular skill and is capable of enabling the minute observation of the fundus of the eye by means of a direct-vision viewfinder.

REFERENCES:
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patent: 4248505 (1981-02-01), Muchel et al.
patent: 4283124 (1981-08-01), Matsumura
patent: 4436388 (1984-03-01), Takahashi et al.
patent: 4469416 (1984-09-01), Isono
patent: 4669837 (1987-06-01), Schirmer et al.
patent: 4699481 (1987-10-01), Matsumura
patent: 4988184 (1991-01-01), Akiyama

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