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.
Cataracts may cause a change of color in one or both of the eyes. Your eyes may begin to look yellowish or even light brown in color. This is caused by clumps of protein in the eyes that can cloud your lens. This will then result in the light having a yellow color to it when it comes into your eye.