When talked about eye colour, people sometimes say that they have blue, green, hazel, etc has nothing to do with it because it's just as an optical illusion.
In real science, the only pigment for eye colour is brown and not green or blue. When talked about eye colour, people sometimes say that they have blue, green, hazel, etc has nothing to do with it because it's just as the optical illusion.
"Everyone has melanin in the iris of their eye, and the amount that they have determines their eye colour," said Dr Gary Heiting, a licensed optometrist and senior editor of the eye care website All About Vision. "There's really only (this) one type of pigment."
Even though all eyes are technically brown, a number of melanocytes vary from person to person. There's really only one "shade" of melanin -- and it's brown!, Heiting said to CNN.
However, people with lighter eyes have fewer melanocytes, making their eyes appear lighter in colour. Those with fewer melanocytes can not absorb as much light, so more light is reflected back out of the eye, Heiting was quoted as saying by the report.
This is called scattering -- and when a light is scattered, it reflects back at shorter wavelengths. On the colour spectrum, shorter light wavelengths correspond with the colour blue.