Metal deposits in the eyes can eventually change your eye color. I had green eyes my entire life, but when my chronic Lyme and electrosensitivities became more severe, I noticed my eyes began to develop copper splotches all around the pupil.
I took oral EDTA, which helps to remove metals, and they are now less green and have very little copper around the pupils. Instead, I now have a light gold ring around the pupils.
I read though that blue and brown are the only two eye colors. If your eyes are any other variance of these, such as green or hazel, you likely have metal and other toxic deposits in your eyes.