Variable contrast direct read-out vision tester

Details Variable contrast direct read-out vision tester Variable contrast direct read-out vision tester

1984-03-01

1986-02-25

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

A61B 302

Patent

active

045726302

ABSTRACT:
A novel vision tester and vision testing method is described which comprises a pair of translucent displays, each transilluminated by electroluminescent lighting panels, the images of the two patterns being superimposed to provide a combined image characterized by a pattern of variable contrast. Light sensors near each light panel provide a measure of the relative intensities of the two images, which provides a measure of the contrast of each combined image. Contrast may be directly read out by processing the signals from the light sensors. The tester may be battery powered for portability.

REFERENCES:
patent: 1981587 (1934-11-01), Dorsey
patent: 2478662 (1949-08-01), Long
patent: 3425772 (1969-02-01), Minas
patent: 3469904 (1969-09-01), Allen
patent: 3737217 (1973-06-01), Haines et al.
patent: 3883234 (1975-05-01), Lynn et al.

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