In a normal eye, light passes through the pupil and is focused by the lens onto the retina at the back of the eye. The retina converts light into electrical impulses that are carried to the brain. The brain interprets the impulses as visual images.
Last Revised: July 20, 2011
Author: Healthwise Staff
Medical Review: E. Gregory Thompson, MD - Internal Medicine & Steven T. Charles, MD - Ophthalmology
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