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.
2 What are the ways that certain injurys cause heterochromia (eye color change)? Many causes : Iris color is a function of the amount of pigment, blood and nerve supply. Trauma and inflammation, injury and surgery and diseases that damage or diminish nerve supply can cause iris color to change.