content provided by Healthwise
Iris and lens
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, the black area in the center of the iris.
The lens is located behind the iris and is normally clear. Light passes through the pupil to the lens. Small muscles attached to the lens can change its shape. Tightening or relaxing these muscles causes the lens to change shape, allowing the eyes to focus on near or far objects (accommodation).
Credits
| Primary Medical Reviewer | Martin Gabica, MD - Family Medicine |
| Specialist Medical Reviewer | Carol L. Karp, MD - Ophthalmology |
| Last Updated | December 19, 2005 |
| Last updated: | December 19, 2005 |
|---|---|
| Reviewed By: | Martin Gabica, MD - Family Medicine, Carol L. Karp, MD - Ophthalmology |
© 1995-2007, Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
This information is not intended to replace the advice of a doctor. By using AOL Body, you indicate that you have read, understood, and agreed to our Terms of Service, and AOL Body Advertising Policy. Read more about our content partners.
