Blue Irides
Blue irides are blue eyes. This means a very blue colouration of the iris. In many people blue eyes are simply their natural eye color, and a result of genetics, although the genetics behind eye color is very complicated. Generally blue eyes are a rare type of eye color in mammals. It is believed blue eyes appeared only anywhere from 6-10,000 years ago. Blue eyes do not contain any blue pigments.The front layer of their eye contains no pigment at all, the fibers scatter, and then light is absorbed in. The light that gets out is usually blue, making eyes appear blue. Some infants are born with bluish eyes which change color, to green or brown over time.