Oh Yeah, Developmental Biology!

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Heterochromia (also known as a heterochromia iridis or heterochromia  iridium) is an ocular condition in which one iris is a different  color from the other iris (complete heterochromia), or where the 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 inherited or  acquired by disease or injury.  This uncommon condition usually results due to uneven melanin  content. A number of causes are responsible, including genetic, such as chimerism, Horners Syndrome and Waardenburg syndrome.

Heterochromia (also known as a heterochromia iridis or heterochromia iridium) is an ocular condition in which one iris is a different color from the other iris (complete heterochromia), or where the 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 inherited or acquired by disease or injury. This uncommon condition usually results due to uneven melanin content. A number of causes are responsible, including genetic, such as chimerism, Horners Syndrome and Waardenburg syndrome.