In anatomy, heterochromia refers to 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; the common incorrect form "heterochromia iridium" is not correct Latin) is of two kinds. In complete heterochromia, one iris is a different color from the other. In partial heterochromia or sectoral heterochromia, part of one iris is a different color from its remainder.
Eye color, specifically the color of the irises, is determined primarily by the concentration and distribution of melanin. The affected eye may be hyperpigmented (hyperchromic) or hypopigmented (hypochromic). In humans, usually, an excess of melanin indicates hyperplasia of the iris tissues, whereas a lack of melanin indicates hypoplasia.
Other articles related to "heterochromia iridum, heterochromia":
... Scherzer has heterochromia iridum of the eye, which means that one iris is a different color from the other his right eye is blue and his left eye is ...
... Sectoral heterochromia a blue iris with a brown section A young adult exhibiting sectoral heterochromia in the form of an orange segment in her right, blue eye ... mother exhibited a similar orange segment in her left eye, although her iris color was green Heterochromia in a child Central heterochromia (both violet-edged with amber ... The yellow eye has what looks like central heterochromia, as the outside of the eye is yellow, and the iris is green Complete heterochromia in a dog one eye blue, one eye brown ...