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What is the black circle around the iris called?

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The black circle around the iris is called the Pupil. The pupil may contract or dilate depending on the amount of light; it limits or increases the amount of light in the eye. Visit http://www.webmd.com/eye-health/amazing-human-eye, http://www.pasadenaeye.com/faq/faq15/faq15_text.html or http://www.99main.com/~charlief/Blindness.htm for more details.

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the iris is the colored part of the eye that circles around the black pupil

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