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.
If you notice a change in eye colour that looks unnatural, or occurs outside of the iris, it could be a sign of a more severe illness, explained Everyday Health. For example, if the whites of your eyes turn red, you most likely have a bacterial infection or chronic dryness.