Less than one percent of global population has gray eyes. Gray eyes are typically found only in European ancestry. Scientists aren't sure what causes gray eyes
Violet eyes are rare, with Elizabeth Taylor being the most famous example. Blue eyes are most common, with Taylor Swift and Brad Pitt among celebrities. Brown eyes are most common, with Idris Elba and Johnny Depp among famous examples. Green eyes are found in only 2% of the world's population
Eye color is determined by pigmentation and light scattering in iris stroma. As of 2010, 16 genes have been associated with eye color inheritance. Blue eyes are highly sexually dimorphic, with men more likely to have them
Brown eyes are most common worldwide, affecting over half of the population. Eye color is determined by pigmentation in the iris, which contains melanin, pheomelanin, and eumelanin. Brown eyes have melanin in both iris layers, while lighter eyes have melanin only in the back layer
Blue eyes result from lacking melanin in the iris's top layer. Approximately 8-10% of world's population has blue eyes. Blue eyes are polygenic, not recessive, with incomplete dominance. Blue eyes evolved 6,000-10,000 years ago in northern Europe
Eye color is determined by more than 50 genes, not just one. Eye color is controlled by melanin pigment in the iris stroma. Three main pigments: melanin, pheomelanin, and eumelanin. Brown eyes are dominant, blue eyes are recessive