Heterochromia

Heterochromia is a very rare condition when one eye is one color but the other is a different color. There are 2 kinds of heterochromia: complete heterochromia and partial heterochromia/sectoral heterochromia. Complete heterochromia is in the beginning of this definition, and partial heterochromia/sectoral heterochromia is when one part of the eye is one color but the other part is a different.

Jason: wow! Your eyes! Do you have eye contacts?
Emily: Jason, I had an injury and caused heterochromia, a very rare condition when one eye is a color but the other eye is a different color.
Jason: cool-