Eye refractive power measuring apparatus

Details Eye refractive power measuring apparatus Eye refractive power measuring apparatus

1986-05-23

1988-05-17

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351208, 351210, A61B 310

Patent

active

047446480

ABSTRACT:
An improved eye refractive power measuring apparatus is disclosed. The apparatus includes a measurement system for projecting a measurement target image to the retina of an eye to be tested and measuring the refractivity of the eye to be tested by detecting the focussing state of the measuring target image. In addition, it has an eye position detection system for detecting a shifted amount from a proper position of the eye to be tested and an arrangement for correcting a measurement result of the eye refractivity based on such detected result.

REFERENCES:
patent: 4196979 (1980-04-01), Kohayakawa
patent: 4408847 (1983-10-01), Wada
patent: 4432617 (1984-02-01), Itoh

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