Usually the color of eyes will not change easily because they are determined by the genetic genes when you are born. If the eye color has been changed, you should check whether there is any problem for your eyes health. You may have the eyes infection which will cause the change of the eye color. You should better go to the hospital to have a check on the eyes.
Sometimes it is normal to get changed colors in the eyes, because there are some deposit of melanin in the iris whose color predominates the color of your eyes. However, in some cases the change of eye colors can be a sign of getting a certain eye disease such as glacoma, cataracts, and so on. In your case, you should go to the doctor's to have your eyes carefully examined so as to find out whether the eyes have cataracts. Cataracts are the result of the degeneration of crystalline lenses where there starts to have white or grey muddiness hindering the normal vision. This usually is caused by increasing age or outer impact such as over exposure to the ultraviolet rays or blue light. You had better pay attention to protecting your eyes from these harms.