THE ABILITY OF COLOR DEFECTIVE OBSERVERS TO RECOGNIZE AN OPTIMIZED SET OF RED, GREEN AND WHITE SIGNAL LIGHTS

Abstract

Restricted red and green colour domains have been recommended by the CIE in order to assist colour defective observers identify coloured signal lights. However, the benefits, if any, of using such a restricted domain with point source signals have never been demonstrated. Sloan and Habel showed that if the colours were relatively large and bright then only protanopes will have difficulty although other studies conclude that some congenital colour defective groups cannot reliably recognise colour signal lights even if their colours lie within the CIE restricted domains. The purpose of this study is to compare the ability of 20 congenitally colour defective observers and 4 normal controls in i..