Submitted by TwoHundredThirteen t3_xz4qze in askscience
I know that there are quite a few rarer eye colors that exist, but I was wondering what the full range of colors that could exist would be, what would need to change for that color to exist, and what effects that might have on eyesight.
girnigoe t1_irotsi6 wrote
So there are 3 things that cause eye color:
You can’t have yellow eyes because the light scattering always happens.
1 You can have light brown eyes or dark brown eyes, w more or less melanin. The brown covers up the blue so it just looks brown.
2 You can have yellow + blue, so green eyes.
3 You can have different amounts of brown pigment in different parts of the iris (usually more brown at the outside), which is called hazel.
4 Or you can have very little pigment & the light scattering gives you blue.
I think there are some not-commonly-done & risky surgeries to inject different pigment…
or you can wear colored contacts for more colors :)