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

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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