Keratometer

Details Keratometer Keratometer

1990-08-15

1995-02-21

Dzierzynski, Paul M.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 310

Patent

active

053920791

ABSTRACT:
The keratometer comprises an illumination system made as the following components located before a cornea: a light source, an objective lens, ring-shaped measuring marks interposed between the light source and the objective lens on the focal surface of the illumination system symmetrically with respect to the optic axis of the objective lens, and a cone-shaped mirror.
The cone-shaped mirror is interposed between the objective lens of the illumination system and the cornea and is shaped as a cone frustum having its inner surface provided with a reflecting coating. The keratometer comprises also a unit for recording the images of the measuring marks and a projection lens, the latter being composed of two elements one of which is in fact the objective lens of the illumination system and the other element is located on the optic axis of the illumination system objective lens between the latter and the unit for recording the images of the measuring marks.

REFERENCES:
patent: 3639043 (1972-02-01), Townsley
patent: 4772115 (1988-09-01), Gersten et al.
patent: 4964715 (1990-10-01), Richards

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