Wide angle objective for examination of the eye

Details Wide angle objective for examination of the eye Wide angle objective for examination of the eye

1978-04-12

1980-09-16

Clark, Conrad J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350205, 350231, 350276SL, 351 7, G02B 304, G02B 900, A61B 314

Patent

active

042226341

ABSTRACT:
A wide angle objective intended especially for visual and photographic examination of the fundus of the eye. Each of the separate lens elements which together make up the objective is so designed that one surface of the element provides the desired refractive power and the other surface of the same element is concentric with the locus of the pupil produced by the surface bearing the refractive power. Also, the objective is so designed that black points are arranged at the locus of the ghost reflections of the mirror conjugated with the pupil of the test subject which are produced in the objective, thereby suppressing disturbing reflections.

REFERENCES:
patent: 3914032 (1975-10-01), Takano et al.

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