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Genetics of Normal and Defective Color Vision
Two types of image forming photoreceptors in the human eye, rods and cones, serve different functions. The capacity to see color is a prominent feature of cone vision and requires multiple classes of cone photoreceptor. Most humans have trichromatic color vision that is mediated by at least three well-separated spectral classes of cone.

The cone photoreceptors that mediate human color vision are classed according to their relative spectral sensitivities as short-, middle- and long-wavelength sensitive. Color information is extracted from neural circuits that compare the outputs of the different cone classes and confer the capacity to distinguish more than 100 different gradations of hue, which include the unique hues alone or in combination. The color palette is greatly reduced for individuals with inherited red-green color vision deficiencies and, in the most severe cases, they lack red and green hue sensations and all of the intermediate color combinations.

Inherited color vision deficiencies are commonly caused by rearrangements, deletions and mutations of genes that encode the protein component (opsin) of the light-absorbing photopigment molecules present in cone photoreceptors. Inherited color vision deficiencies are categorized according to the number of functional cone types present in the retina. Monochromacy, dichromacy and anomalous trichromacy correspond to the presence of one, two or three functional cone types, respectively. All are caused by mutations that alter the complement of functional cone opsins expressed. Here we give an overview of the role of genetic variation in the L, M and S-cone opsin genes as the primary cause of inherited color vision deficiency and discuss identified combinations of normal polymorphisms in these genes that cause a variety of vision disorders including cone dysfunction, myopia, cone dystrophy and color vision deficiencies.

Jan 30, 2020 01:00 PM in Eastern Time (US and Canada)

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