The amount of melanin in the eyes may influence certain health risks. For example, people with lighter eye colors may have increased sensitivity to light.
Research also suggests individuals with blue, green, or gray eyes may face a slightly higher risk of conditions such as age-related macular degeneration or uveal melanoma. Meanwhile, brown eyes may provide some protection from ultraviolet light because of their higher melanin content.
Understanding eye color percentages highlights how genetics, evolution, and pigmentation work together to create the wide variety of human eye colors seen across the world.
We created this article in conjunction with AI technology, then made sure it was fact-checked and edited by a HowStuffWorks editor.
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