Eye refractive error measuring device

Details Eye refractive error measuring device Eye refractive error measuring device

1981-01-15

1984-02-21

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 310

Patent

active

044326173

ABSTRACT:
A device for measuring the refractive error of an eye in which refractive powers in a plurality of longitudinal directions are simultaneously measured with a high S-N ratio with a high accuracy. A movable chart is provided in a predetermined direction in a plane perpendicular to an optical axis of an optical system which projects the image of the chart onto the retina of the eye being examined. Measuring means measures the refractive error of the eye in accordance with the state of the optical system at the position thereof at which the image projected onto the retina is in focus. The chart has plural striped patterns which are oriented at different angles from one another.

REFERENCES:
patent: 3880501 (1975-04-01), Munnerlyn
patent: 4266862 (1981-05-01), Trotscher et al.
patent: 4272165 (1981-06-01), Muchel et al.
patent: 4306778 (1981-12-01), Wada et al.

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