Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1985-01-23
1986-10-07
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351243, A61B 302
Patent
active
046155945
ABSTRACT:
A novel vision test device and method for measuring the ability of a subject to perceive contrasts is described, which comprises a chart for display to the subject having a plurality of visual test shapes systematically organized thereover in a predetermined array on a background of preselected luminance or reflectance level, each test shape having a preselected luminance level providing maximum contrast relative to background at its center and substantially zero contrast relative to background at its edges, the luminance (or reflectance) level of each test shape varying radially from its center outwardly according to a Gaussian distribution of preselected distribution factor.
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Bovernick Rodney B.
Scearce Bobby D.
Singer Donald J.
The United States of America as represented by the Secretary of
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