Eye fundus camera having working distance detecting device

Details Eye fundus camera having working distance detecting device Eye fundus camera having working distance detecting device

1980-01-29

1982-12-28

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351214, 354 62, A61B 314, A61B 310

Patent

active

043658725

ABSTRACT:
Eye fundus camera having an illuminating system including a ring-shaped aperture and a ring-shaped mirror for preventing corneal reflection from entering the photographing optical system. The instrument further includes a working distance detecting device comprised of a light emitting element and a light sensitive element which are disposed at the opposite sides of and symmetrically with respect to the optical axis of the objective lens. The ring-shaped aperture in the illuminating system has masking portions along a plane corresponding to a plane which contains the optical axis of the objective lens and the light emitting and light sensitive elements.

REFERENCES:
patent: 4257687 (1981-03-01), Kohayakawa

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