Dr. Matt Lee (mattl)

Amazing the things you find on Wikipedia.

Heterochromia (also known as a heterochromia iridis or heterochromia iridium) is an eye condition in which one iris is a different color from the other (complete heterochromia), or where part of one iris is a different color from the remainder (partial heterochromia or sectoral heterochromia). It is a result of the relative excess or lack of pigment within an iris or part of an iris, which may be genetically inherited or due to mosaicism, or acquired by disease or injury.

I have this.