Test disk for eye examination

Details Test disk for eye examination Test disk for eye examination

1975-10-17

1977-10-11

Chatmon, Jr., Saxfield

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 13, 351 30, 351 36, A61B 302

Patent

active

040532127

ABSTRACT:
An exchangeable device providing test patterns for eye examinations is provided to be insertable into an eye examination instrument, such as a projector or an eyepiece instrument. This device includes a cassette containing a rotatable disk carrying different test patterns with the test patterns being visible through light transparent portions of the cassette. The cassette is insertable into the instrument, and the test pattern is illuminated through the light transparent portions with the disk being rotated through coupling elements connected to a drive mechanism of the instrument to vary the test pattern.

REFERENCES:
patent: 1698013 (1929-01-01), DeZeng
patent: 2357593 (1944-09-01), Leavell
patent: 3486813 (1969-12-01), Johnston
patent: 3807839 (1975-04-01), Sugarman et al.
patent: 3910690 (1975-10-01), Regan

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