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.
âVisible light (not UV radiation) causes pupil constriction, eyelid closure and squinting which can reduce penetration of the sunâs rays on a sunny day.â Jadrijevic continues by warning that, visible light is minimised on cloudy days but the exposure to harmful UV rays is still high.