“Although irises come in different colors (iris = rainbow), they contain only brown pigment. When they have a lot of pigment, the eyes appear brown or black. If the amount of pigment is small and restricted to the posterior surface of the iris, the unpigmented parts simply scatter the shorter wavelengths of light and the eyes appear blue, green, or gray. Most newborn babies’ eyes are slate gray or blue because their iris pigment is not yet developed.”
―
Human Anatomy & Physiology 11th Latest Edition Elaine N. Marieb
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