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The irises of human eyes exhibit a wide spectrum of colours Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye 's iris [1][2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. [3]: 9 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 ... Having blue eyes is very different from every other eye color, and it’s not just a matter of what they look like. Here are eight interesting facts about blue eyes that you might find surprising. People can have blue eyes, brown or black eyes which passed through genes from one generation to another rare occurrence in all eye colours. The most common shades of blue eyes are light blue, dark blue, sapphire blue, and blue gray. Some rarer shades of blue eyes include hazel blue, ice blue, and aqua blue.
