Blue Eyes Office for Science and Society - McGill University

Most babies are born with blue eyes because at the time of their birth melanin has not been ‘deposited’ in the iris. Melanin is a light-absorbing biopolymer synthesized from the amino acid tyrosine. It is responsible for determining eye colour and is encoded by genes, therefore, babies of Asian, African and Latino descent, normally, have more melanin indicating that their eye color is brown at birth. After six months, the babies’ genes determine the melanin production in the iris. This will dictate if the eyes remain blue or turn gray, green, hazel or brown. A long term study concluded that people's’ eye color can continue to change into adulthood.

Scott McCloskey, Ph.D.

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