Abstract

Under reduced visual conditions, small area and low luminance, color discrimination for normal eyes deteriorates in a manner similar to that observed for tritanopic vision. The purpose of this study was to investigate and quantify the reciprocal relation between area and luminance for conditions for which this loss of color discrimination occurs, for people with normal vision. Quadratic equations, ln s=a(lnF)2+b(lnF)+c, were obtained from the empirical data to describe the relationship between chromaticity discriminability, s, and luminous flux, F; where s=the standard deviation of color matches and F=ω34L (target solid-angle subtense, ω, and luminance L). The constants a, b, and c are different for the red–green and blue–yellow directions on the chromaticity diagram.

© 1969 Optical Society of America

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