From Wikipedia: In anatomy, 
heterochromia refers to a difference in coloration, usually of the iris but also of hair or skin. Heterochromia is a result of the relative excess or lack of melanin (a pigment). It may be inherited, due to genetic mosaicism, or due to disease or injury. Design of the natural variety:



 
David Bowie was punched and suffers from permanent dilation of the left pupil - his is therefore not natural. Lovely photos, though.
ReplyDeletedilation of the pupil has nothing to do with the iris color
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