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NOBlue eyes are a human eye color characterized by a light appearance resulting from low levels of pigment called melanin in the iris. Unlike brown eyes, which contain higher amounts of melanin, blue eyes do not actually contain blue pigment; instead, their color is caused by the scattering of light in the iris, a phenomenon known as Rayleigh scattering. This same effect is responsible for the blue color of the sky. Blue eyes are most commonly found among people of European descent, particularly in regions such as Estonia, Finland, and Ireland, where a significant portion of the population has this eye color. The genetic origin of blue eyes is believed to be linked to a mutation in the OCA2 gene that occurred thousands of years ago, leading to reduced melanin production in the iris. This mutation is thought to have first appeared in a single individual and then spread through generations. Blue eyes may also be more sensitive to light due to the lower melanin levels, which provide less natural protection against bright light. Over time, the study of eye color, including blue eyes, has contributed to research in genetics, human evolution, and anthropology.
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