Eye bottom camera

Details Eye bottom camera Eye bottom camera

1976-02-18

1978-07-04

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 6, 354 62, A61B 314, G03B 2900

Patent

active

040985490

ABSTRACT:
The present invention relates to an eye bottom camera which is so designed that in order to eliminate the undesired light beam reflected by the objective lens opposed to the eye to be inspected the objective lens as one group of biconvex type whereby by making the undesired light beams reflected on both surface of the objective lens as if they were produced by a light beam emitted from a same plane of the illumination optical system the small black spot provided on the same plane can be made small and further by so designing that the image formed in the neighborhood of the objective lens, of the small black spot appears at the position closer to the eye to be inspected than the surface of the objective lens it is made difficult that the small black spot be formed on the eye bottom to be inspected.

REFERENCES:
patent: 3594071 (1971-07-01), Okajima
patent: 3851954 (1974-12-01), Kato et al.
patent: 3925793 (1975-12-01), Matsumura et al.

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