Barbara Marquand is a staff writer at NerdWallet, a personal finance website. Email: bmarquand@nerdwallet.com. Twitter: @barbaramarquand.
The eye may change color due to alteration of genes in the cells of the iris. This is because of your DNA factors in the body. The gene alteration can cause the eye to change color from brown to green and vise verse. There is no any explanation to the cause of the genes behaving in these manner. Prolonged exposure to the sun might also be another cause that made my eyes to change the color.
Most Common. The most common eye color throughout the world is brown. A high amount of melanin, the pigment that also causes darker hair and skin tone, will cause brown eye color. Very dark eyes may appear to be black. Brown eyes are common through all races and in all parts of the world.