Accession Number : AD0646575

Title :   THE EFFECT OF WAVELENGTH ON VISUAL ACUITY.

Descriptive Note : Final rept., 1 Oct 65-31 Sep 66,

Corporate Author : EYE RESEARCH FOUNDATION BETHESDA MD

Personal Author(s) : Cavonius,Carl Richard

Report Date : JAN 1967

Pagination or Media Count : 22

Abstract : Visual acuity was measured in monochromatic light at wavelengths between 440 and 660 nm. The test objects were gratings which filled a 1.5 degree circular field centered in a 30 degree neutral surround. Luminance contrast between adjacent bars was adjustable, and acuity thresholds were determined for different contrasts. It was found that acuity depends primarily on luminance contrast and only slightly on wavelength, so that the same luminance contrast yields similar acuity thresholds at all wavelengths provided that the test objects are equated in luminance. It is suggested that the dominant wavelength of a visual display system (such as a cathode ray screen) is relatively unimportant in the perception of fine detail. Instead, criteria such as grain size and available luminance are more important. (Author)

Descriptors :   (*COLOR VISION, VISUAL ACUITY), (*VISUAL ACUITY, THRESHOLDS(PHYSIOLOGY)), ULTRAVIOLET SPECTRA, VISIBLE SPECTRA, LUMINESCENCE, BRIGHTNESS, DISPLAY SYSTEMS, THRESHOLDS(PHYSIOLOGY), BACKGROUND, MONOCHROMATIC LIGHT, VISUAL PERCEPTION

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE