Heterochromia comes from the Greek word "heteros" which mean different and "chroma" which means color. It is a condition where a person has two distinct eye colors. One can have this condition from birth or develop it over time. The colored part of the eye (Iris) consists of one of the colors, such as brown, green, black and blue. But some people have unique colors in one eye, and some have different eye colors because of heterochromia.