Visibility gauge

Details Visibility gauge Visibility gauge

1981-11-10

1986-01-14

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351222, 351246, A61B 300

Patent

active

045642745

ABSTRACT:
A visibility gauge in the form of a disc or strip of diffusing material arranged to be interposed in the light path from a subject to an observer. The diffusiveness of the strip varies along its length so that the contrast between the subject and its background can be selectively varied by arranging the strip to transmit progressively greater or smaller proportions of diffused light until a threshold of visibility is reached. The strip may be in the form of a wedge of diffusing material or a clear strip with one surface treated to be progressively more diffusive towards one end.

REFERENCES:
patent: 2313240 (1940-07-01), Hubbard
patent: 2379103 (1943-11-01), Rath
patent: 2484735 (1945-10-01), Rath
patent: 2528513 (1950-11-01), Grether
patent: 2770164 (1956-11-01), Olmsted et al.
patent: 2955507 (1960-10-01), Leitz
patent: 3415594 (1968-12-01), Aulhorn
patent: 3436840 (1969-04-01), Noxon
patent: 3599545 (1971-08-01), Durr
patent: 4192995 (1980-03-01), Anthon
Luckiesh, Test Charts Representing a Variety of Visual Tasks, 3/1944, Amer. Journal of Opthal.

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