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 cornea is the outer clear, round structure that covers the iris and the pupil. The cornea directs light rays
into the eye and helps focus them on the light-sensitive retina at the back of
the eye, providing sharp, clear vision.
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 make the lens change shape, allowing the eyes to focus on near or far objects.
Primary Medical Reviewer
Adam Husney, MD - Family Medicine
Specialist Medical Reviewer
Christopher J. Rudnisky, MD, MPH, FRCSC - Ophthalmology
November 1, 2011
WebMD Medical Reference from Healthwise
November 01, 2011
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