what is heterochromia
In anatomy, heterochromia (ancient Greek: á¼ÏÎµÏÎ¿Ï, hÃ©teros, different + ÏÏÏÎ¼Î±, chrÃ³ma, color) is a difference in coloration, usually of the iris but also of hair or skin. Heterochromia is a result of the relative excess or lack of melanin (a pigment). It may be inherited, or caused by genetic mosaicism, chimerism, disease, or injury. Heterochromia of the eye (heterochromia iridis or heterochromia iridum) is of three kinds.