Eye fundus camera free from undesired reflected and diffused lig

Details Eye fundus camera free from undesired reflected and diffused lig Eye fundus camera free from undesired reflected and diffused lig

1976-11-24

1978-07-25

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 16, 354 62, A61B 310

Patent

active

041025636

ABSTRACT:
The present invention relates to an eye fundus camera free from undesired reflected and diffused light beams. The camera uses a photographic optical system including an objective lens, a reflecting means, an aperture means, a photographic lens system for imaging the eye fundus to be inspected in sequence on a photographic plane and an illumination optical system including at least a light source, a relay lens and a ring-shaped aperture. The optical system leads the light beam from the light source to the eye to be inspected through the reflecting means and the objective lens, whereby the ring-shaped aperture is positioned in the illumination optical system in such a manner that the image of the ring-shaped aperture is formed near the iris in the eye to be inspected while the aperture is positioned in such a manner that the conjugate position of the aperture with reference to the objective lens is near the cornea to the eye to be inspected. The undesired reflected and diffused light beam out of the illumination light beam taking place in the eye to be inspected is thereby eliminated.

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

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