Sons and mothers: classification of colour-deficient and heterozygous subjects by counterphase modulation photometry

In the OSCAR test of Estavez et al (1983) red and green lights are modulated in counterphase and the subject is asked to adjust their relative depths of modulation so as to minimize flicker. In a population consisting of normal mothers and carriers of colour deficiency (classified by their sons’ performance on the Nagel anomaloscope), the OSCAR settings of the mothers were strongly correlated with those of their sons. Protan and deutan carriers formed discrete populations; and many individual carriers of protan deficiencies could be distinguished from normals with confidence. Protan and deutan sons were distinguished from each other with complete reliability, but some deutan sons, and most deutan carriers, fell within the distribution of normal settings.

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