Well, it is not for your eyes to have change on eye color. Exactly, people are born with certain, different eye color. For example, some people have black eyes. And of course, in common, the eye color will not change with time. But on the other hand, according to some researches, eye color can just change with emotion and weather. Also, temperature can just has effect on eye color too. For example, when you are very angry, it will just make your eye color become darker than normal. Of course, some eye surgery, even some eye diseases can just make your eye color change. But that can be a sign of serious disease. So just be careful about it.