Eye fundus camera

Details Eye fundus camera Eye fundus camera

1978-10-10

1980-04-15

Griffin, Donald A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351 6, G03B 2900, A61B 310

Patent

active

041981448

ABSTRACT:
An eye fundus camera permitting simple focusing is disclosed. An optical system with a microprism projects an image of a focusing mark on the eye fundus.
When the mark image formed on the eye fundus is not just focused, this mark image is divided and separated into at least three directions. An objective lens forms the image which is formed on the eye fundus on a recording film and cooperates with the projection lens of the mark projection optics. Therefore, the objective lens can be focused by observing the mark image which is formed on the eye fundus.

REFERENCES:
patent: 2940371 (1960-06-01), Thurow
patent: 3003387 (1961-10-01), Schiele
patent: 3016000 (1962-01-01), Noyori
patent: 3572909 (1971-03-01), Van Patten et al.
patent: 3914032 (1975-10-01), Takano et al.
patent: 3925793 (1975-12-01), Matsumura et al.
patent: 3936844 (1976-02-01), Matsumura
patent: 3986030 (1976-10-01), Teltscher

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