Three Cool Facts About Human Eye Colour [According to Wikipedia]
1. Every eye colour in humans is caused by the variation in concentration and distribution of a single brown-black pigment called melanin. There are no blue or green pigments in human eyes. The colour depends on how much melanin is present in the eye and where in the eye it is.
2. There are at least 15 different genes controlling eye colour in humans and it’s inheritance is so complex that it is believed that almost any parent-child combination is possible. That is, parents of almost any eye colour can most likely have a child of almost any other eye colour.
3. Eye colours such as blue or green occur due to an event known as Rayleigh scattering (the scattering of light by particles smaller than the wavelength of light). This is the same event which causes the sky to be blue.
To find out more go to:
Eye Colour in humans And Rayleigh scattering