Night vision testing method and apparatus

Details Night vision testing method and apparatus Night vision testing method and apparatus

1974-05-20

1976-02-03

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 36, 351 39, A61B 306

Patent

active

039361624

ABSTRACT:
A subject whose vision is to be tested wears a face mask having an eyepiece in which is mounted a light-emitting diode connected to means for varying the light intensity of the diode in a time ordered sequence. The level of light intensity is also numerically displayed to the operator of the device. The test subject is provided with means for selectively stopping and resetting the sequence of varying light intensities to an initial intensity and automatically repeating the cycle.

REFERENCES:
patent: 2239164 (1941-04-01), Wigelsworth
patent: 2283769 (1942-05-01), Schwanzel

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