You are trying to load the Human Atlas. Either you do not have the newest version of Adobe Flash®, or you have JavaScript disabled, both of which are required to use this system.

Adjust Font Size
 
Search Health Information   
 
•Encyclopedia Home
•Special Topics A-Z
•Read Spanish version
Images
Iris
Iris
 
More Features
•Printer-friendly version
 

Iris

Definition

The iris is the colored part of the eye located between the cornea and lens. The iris' round, central opening (the pupil) shrinks and widens to control light coming into the eye. This allows you to see well under different lighting conditions.

Inflammation of the iris is called iritis.

References

Evans M. Uveitis and other intraocular inflammations. In: Yanoff M, Duker JS, eds. Ophthalmology. 3rd ed. St. Louis, Mo: Mosby Elsevier; 2008:chap 7.

Review Date: 8/14/2011
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
adam.com