Accession Number : ADD012614

Title :   Vision Test Chart and Method Using Gaussians.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Task,Harry L

Report Date : 07 Oct 1986

Pagination or Media Count : 7

Abstract : A novel vision test device and method for measuring the ability of a subject to perceive contrast 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 Gaussian distribution of preselected distribution factor. (Patents)

Descriptors :   *PATENTS, *TEST EQUIPMENT, *VISION, DISTRIBUTION, LUMINANCE, REFLECTANCE, SHAPE, CHARTS, CONTRAST

Subject Categories : Medical Facilities, Equipment and Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE