Fundus observation and photographing optical system

Details Fundus observation and photographing optical system Fundus observation and photographing optical system

1979-12-20

1982-03-30

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

354 62, A61B 314, G03B 2900

Patent

active

043221378

ABSTRACT:
In a fundus observation and photographing optical system having an objective lens for forming a primary image of the fundus of an eye to be examined, an apertured mirror disposed rearwardly of the objective lens and obliquely with respect to the optic axis of the lens and having an opening on the optic axis, an illuminating optical system for supplying illuminating light to the eye via the apertured mirror and through the objective lens, and an image forming relay lens for forming a secondary image from said primary image, the objective lens has, in succession from the side of the eye, a first group comprising a biconvex lens having its more sharply convex surface facing the apertured mirror, and a second group comprising a doublet of a biconvex lens and a biconcave lens and having its concave surface facing the apertured mirror.

REFERENCES:
patent: 3914032 (1975-10-01), Takano et al.
patent: 3915564 (1975-10-01), Urban
patent: 4098549 (1978-07-01), Matsumura
patent: 4222634 (1980-09-01), Muchel

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