Abstract

An experimental investigation is made of Judd’s proposed three-color code for instrument panel lights. The adequacy of these specifications is tested using both normal and color-deficient subjects. It is shown that if certain specific limiting conditions are met as to the luminance, subtense, and chromaticity of the light signals, all normal observers and a majority of color-deficient observers can make the necessary identifications. The possible explanations for the poor performance of some, but not all, protanopes are discussed.

© 1955 Optical Society of America

Recognition of Red and Green Point Sources by Color-Deficient Observers*

Louise L. Sloan and Adelaide Habel
J. Opt. Soc. Am. 45(8) 599-601 (1955)

An Experimental Determination of Some Iso-Chromaticity Lines in Color-Deficient Vision*

Rita M. Halsey and A. Chapanis
J. Opt. Soc. Am. 42(10) 722-739 (1952)

Some Problems Related to Testing Color Vision with the Nagel Anomaloscope

Ingeborg Schmidt
J. Opt. Soc. Am. 45(7) 514-522 (1955)

Some Quantitative Aspects of an Opponent-Colors Theory. II. Brightness, Saturation, and Hue in Normal and Dichromatic Vision

Leo M. Hurvich and Dorothea Jameson
J. Opt. Soc. Am. 45(8) 602-616 (1955)

Recognition of Colored Road Traffic Light Signals by Normal and Color-Vision-Defective Observers*

John Nathan, Geoffrey H. Henry, and Barry L. Cole
J. Opt. Soc. Am. 54(8) 1041-1045 (1964)