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When the pupil size changes, the pigments in the iris compress or spread apart, changing the eye color a bit. Certain emotions can change both the pupil size and the iris color. That's why some people say their eyes change colors when they're angry or loving. Eye color also can change with age. This happens in 10 to 15 percent of the Caucasian population (people who generally have lighter eye colors). For instance, my once very brown eyes are now hazel, a combination of brown and green.
Why Do Babiesâ Eyes Change Color? When we talk about baby eye color, weâre referring to the color of the irisâthe part of the eye behind the cornea that controls the size of the pupil to let light in. There are two reasons why baby eye color changes: genetics and melanin. Genetics. The genes babies inherit from both parents play a role in determining their newborn eye color. In fact, experts say there are approximately 15 genes that are responsible for baby eye color, but twoâOCA2 and HERC2âare the most predominant.