I know that eye color is directly related to the amount of melanin present in the front layers of the iris. But what’s the biological need behind different color?
In: 98
High melanin provides better protection from harsh, glaring light. People in bright places may have been better hunter/gatherers as a result, so eyes with melanin were a biologic advantage over eyes without.
But, not all of the Earth is bright, the farther north you go the less of this benefit you see, so eyes without melanin are “about as good” so there isn’t biologic pressure to select for brown eyes.
Latest Answers