As we all known, eye color can be decided by two distinct factors: the pigmentation of the eye's iris and the frequency-dependence of the scattering in the stroma of the iris. Eye color is thus an instance of structural color and varies depending on the lighting conditions, especially for lighter-colored eyes. The black of your eyes are permanent indeed unless you are old and you take some artificial ways to change it. That is, our eye color will fade with time flies. The only way to change your eye color permanent is take surgery. But you still can change your eye color by making up and wearing contact lenses.
