Heterochromia is basically an ocular condition in which one iris is a different color from the other iris, and is a result of the relative excess or lack of pigment within an iris or part of an iris. This uncommon condition usually results due to uneven melanin content. A number of causes are responsible, including genetic, such as chimerism, Horner’s syndrome and Waardenburg syndrome. This is what a cat looks like with heterochromia. Continue reading for more.