The iris is the colored portion of the eye located between the cornea and lens. The iris' round, central opening (the pupil) contracts and dilates to control the entrance of light into the eye, allowing you to see well under a variety of lighting conditions.
© 2011 University of Maryland Medical Center (UMMC). All rights reserved.
UMMC is a member of the University of Maryland Medical System,
22 S. Greene Street, Baltimore, MD 21201. TDD: 1-800-735-2258 or 1.866.408.6885