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Why are people's eyes different colors?

June 30, 2019, 5:09 p.m. -- Latest version
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The amount of melanin in the eye causes eye color. Lots of melanin causes very dark browns and blacks, while less melanin causes lighter brown, hazel, and green colors. Blue eyes indicate a complete absence of melanin in the eye. Like melanin in the skin, eye pigmentation evolved to defend against excessive sunlight and UV exposure, with the most melanin being found in populations living in areas with the greatest sun exposure. This is why those who have lighter eye colors are encouraged to wear sunglasses, much like those with lighter skin colors being encouraged to wear sunscreen; their eyes are more vulnerable to sunlight and UV damage.

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