<P> Eye color is a polygenic phenotypic character determined by two distinct factors: the pigmentation of the eye's iris and the frequency - dependence of the scattering of light by the turbid medium in the stroma of the iris . </P> <P> In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin in the iris pigment epithelium (located on the back of the iris), the melanin content within the iris stroma (located at the front of the iris), and the cellular density of the stroma . The appearance of blue and green, as well as hazel eyes, results from the Tyndall scattering of light in the stroma, a phenomenon similar to that which accounts for the blueness of the sky called Rayleigh scattering . Neither blue nor green pigments are ever present in the human iris or ocular fluid . Eye color is thus an instance of structural color and varies depending on the lighting conditions, especially for lighter - colored eyes . </P> <P> The brightly colored eyes of many bird species result from the presence of other pigments, such as pteridines, purines, and carotenoids . Humans and other animals have many phenotypic variations in eye color . The genetics of eye color are complicated, and color is determined by multiple genes . So far, as many as 15 genes have been associated with eye color inheritance . Some of the eye - color genes include OCA2 and HERC2 . The earlier belief that blue eye color is a simple recessive trait has been shown to be incorrect . The genetics of eye color are so complex that almost any parent - child combination of eye colors can occur . However, OCA2 gene polymorphism, close to proximal 5 ′ regulatory region, explains most human eye - color variation . </P> <P> Eye color is an inherited trait influenced by more than one gene . These genes are sought using associations to small changes in the genes themselves and in neighboring genes . These changes are known as single - nucleotide polymorphisms or SNPs . The actual number of genes that contribute to eye color is currently unknown, but there are a few likely candidates . A study in Rotterdam (2009) found that it was possible to predict eye color with more than 90% accuracy for brown and blue using just six SNPs . There is evidence that as many as 16 different genes could be responsible for eye color in humans; however, the main two genes associated with eye color variation are OCA2 and HERC2, and both are localized in Chromosome 15 . </P>

Where does the color of your eye come from
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