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
Two reasons. Firstly, blue eyes less useful than brown but they’re not so detrimental that blue eyed people are handicapped. In fact someone with blue eyes might never learn that blue eyes have worse day vision and it would not change their life at all. The other reason is attractiveness. To a lot of people, blue eyes are quite pretty. If evolution was based purely utility, peacocks would’ve died out long ago. Being able to attract a mate is just as important as the strength to survive to adulthood.
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