Illustration copyright 2000 by Nucleus Communications, Inc. All rights reserved. http://www.nucleusinc.com
The iris is the colored part of the eye. A circular muscle in the iris controls the amount of light entering the eye through the pupil.
| By | Healthwise Staff |
| Primary Medical Reviewer | Kathleen Romito, MD - Family Medicine |
| Specialist Medical Reviewer | Christopher J. Rudnisky - Ophthalmology |
| Last Revised | November 6, 2009 |
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