Ophthalmoscopic optical system

Details Ophthalmoscopic optical system Ophthalmoscopic optical system

1977-02-24

1979-03-27

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

A61B 314

Patent

active

041463102

ABSTRACT:
An ophthalmoscopic photographing and observing system eliminates rays of light reflected and scattered at the cornea and the crystalline lens of a human eye. An illuminating optical system is provided with light shielding stops at positions conjugate to the corneal surface, the iris, and the rear face of the crystalline lens of an eye being examined. The sizes of these light shielding stops are such that an image of the stop conjugate to the corneal surface covers an area on the cornea where the light reflected by the fundus of the eye passes through the cornea covered with an image of the stop which is conjugate to the corneal surface; an image of the stop which is conjugate to the rear surface of the crystalline lens covers an area on the rear face of the crystalline lens where the light reflected by the fundus of the eye passes through. A ring-shaped aperture stop is conjugate to the iris.

REFERENCES:
patent: 3533683 (1970-10-01), Stark et al.
patent: 3851954 (1974-12-01), Kato et al.
patent: 3936844 (1974-03-01), Matsumura

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