Skip navigation | ||
|
||
Sense of sight
Vision occurs when light is processed by the eye and interpreted by the brain. Light passes through the transparent eye surface (cornea). The pupil (the black opening in the front of the eye) is an opening to the eye interior. It can get larger or smaller to regulate the amount of light entering the eye. The colored portion (iris) is really a muscle controlling the pupil size. The inside of the eye is filled with a gel-like fluid. There is a flexible, transparent lens that focuses light so it hits on the back of the eye (the retina). The retina converts light energy into a nerve impulse that is carried to the brain and then interpreted.
Update Date: 1/18/2007 Updated by: Sandra W. Cohen, M.D. Private Practice specializing in geriatrics, Brooklyn, NY. Review provided by VeriMed Healthcare Network.
Home | Health Topics | Drugs & Supplements | Encyclopedia | Dictionary | News | Directories | Other Resources | |
Copyright | Privacy | Accessibility | Quality Guidelines U.S. National Library of Medicine, 8600 Rockville Pike, Bethesda, MD 20894 National Institutes of Health | Department of Health & Human Services |
Page last updated: 02 January 2008 |