Unique hues in heterozygotes for protan and deutan deficiencies

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We measured the wavelengths of unique blue, green, and yellow in a population of normal women and carriers of different forms of red-green deficiencies. In the case of unique blue and green none of the groups of heterozygotes differed significantly from normals. In the case of unique yellow, at a retinal illuminance of 800 td, carriers of protanomaly made settings at significantly shorter wavelengths than any other group. Carriers of deuteranomaly, deuteranopia and protanopia did not differ from normal individuals. At 20 td none of the groups of heterozygotes differed from normal. Our results offer no support for the hypothesis of Cicerone (1987) that the wavelength seen as unique yellow is determined primarily by the relative numbers of L to M cones. Nor do we have any evidence for the report of Donders (1884) that the settings of unique yellow vary with Rayleigh matches