Eye fundus inspection device capable of high speed focusing

Details Eye fundus inspection device capable of high speed focusing Eye fundus inspection device capable of high speed focusing

1978-07-06

1981-04-28

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 13, 351 16, 354 62, A61B 314, A61B 310, G03B 2900

Patent

active

042641535

ABSTRACT:
The disclosed eye examination device focuses on the fundus of an eye. A transparent plate with a black line or a plate with a slit is illuminated and the image of the black line or the slit projected on the eye fundus through an objective lens. A bi-prism with a split plane is arranged so that the split plane is always optically conjugate with the transparent or slit plate relative to the eye fundus. When observed through the bi-prism, the image of the black line or the slit forms one line when the eye fundus is exactly in focus, while the image is separated when the eye fundus is out of focus.

REFERENCES:
patent: 2940371 (1960-06-01), Thurow
patent: 3016000 (1962-01-01), Noyori
patent: 3259039 (1966-07-01), Okajima
patent: 3925793 (1975-12-01), Matsumura et al.

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