biology question #879

Meghan, a 14 year old female from Chelsea asks on August 16, 2002,


How is it possible to have 2 different colored eyes? I have a blue and a brown eye. I would like to know what has caused this. How rare is it? I heard that there is a national day, is that true?

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the answer

Barry Shell answered on September 1, 2002, A:

The medical name for having eyes of different colours is Heterochromia Iridis. You can go to Google and search for this condition and you will find a lot of information. I could not find the exact rate at which it occurs. Maybe one in 10,000 or 100,000. Its cause can be genetic, or from a serious injury or shock to the body either as a fetus or as a child. I could not find out anything about a National Day for Heterochromia Iridis.

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