On what is eye color in humans dependent?

Eye color in humans is primarily determined by genetic factors that influence the amount and distribution of melanin in the iris. The main genes involved include OCA2 and HERC2, which regulate melanin production. Higher melanin levels typically result in darker eye colors, such as brown, while lower levels can lead to lighter colors like blue or green. Environmental factors and evolutionary adaptations may also play a role in the variation of eye color across different populations.