Blue eyes do not actually contain any blue pigment; their striking color is entirely an optical illusion. Globally, they are relatively rare, occurring in only about 8% to 10% of the world’s population. The Science and Physics Behind the Illusion
Zero Blue Pigment: The human eye only produces brown melanin. Dark eyes have a high concentration of melanin, while blue eyes have a distinct lack of pigment in the front layer of the iris (the stroma).
Rayleigh Scattering: Instead of chemical coloring, blue eyes get their shade from physics—the exact same way the sky appears blue. When light hits an iris lacking melanin, the shorter blue wavelengths scatter and reflect back out to the viewer.
Dynamic Shades: Because the color relies entirely on light reflection, blue eyes can appear to subtly change shades depending on the lighting conditions, clothing, or makeup of the person. Genetics and Evolutionary History 5 Things You Might Not Know About Blue Eyes
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