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Eye colors are passed down through generations, but sometimes genetic variations can lead to surprising results in eye colors. Learn about the genetics of eye color in this guide. Whether eyes are blue or brown, eye color is determined by genetic traits handed down to children from their parents. A parent's genetic makeup determines the amount of pigment, or melanin, in the iris of the his or her child's eye. With high levels of brown melanin, the eyes look brown. With minimal levels of the same brown melanin, the eyes look blue. However, a genetic variation can cause a child's eye color to be unpredictable, resulting in two blue-eyed parents having a brown-eyed child.