High-precision ophthalmometer which is independent of distance

Details High-precision ophthalmometer which is independent of distance High-precision ophthalmometer which is independent of distance

1981-01-12

1983-10-18

Evans, F. L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 310

Patent

active

044102429

ABSTRACT:
An ophthalmometer measurement system employs two flat glass plates which move in opposite pivoted directions, to determine the distance between two mirror images on the cornea. The pivot suspensions and pivotal-displacement mechanism are free of play and account for a three-fold improvement in precision of measurement. Provision is made for adjustment to compensate for manufacturing tolerances, in glassplate thickness and mechanical-parts manufacture.

REFERENCES:
patent: 2733634 (1956-02-01), Littmann et al.
patent: 3290927 (1966-12-01), Gambs
patent: 4315672 (1982-02-01), Muller

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