Why is the human eye colour generally Brown, Blue and other similar variations. Why no bright green, purple, black or orange?
In: Biology
Edit: thanks for the silver kind stranger!
Eyecolor is determained by the amount of melanin in the iris. Melanin is a darkish pigment that helps protext the skin and eyes by blocking damaging UV rays.
The color comes from how light is refracted in your eyeball with the melanin. Blue eyes have the least amount, leading to the color blue being reflected mostly, in a processes similar to how the sky is blue.
More melaanin causes more brown tones, leading to green with a little more, and greys and growns with other amounts.
The way light reflects with this pigment doesn’t allow for purple or other colors to show.
In short the same reason why *human skin isn’t anything else but light to dark brown and also the same reason why *human hair is naturally certain shades of one another like brown, blonde, black, red, etc. It’s because of a natural pigment group of amino acids called melanin that is the pigment in most living organisms. When is comes over to eye color, blue means no melanin in the eye, and when light particles get absorbed they gets scattered back into the atmosphere. Eyes with a little bit of melanin are green to hazel and eyes with a lot of melanin are brown to dark brown.
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