An official website of the United States government
Here’s how you know
Official websites use .gov A
.gov website belongs to an official government
organization in the United States.
Secure .gov websites use HTTPS A
lock (
) or https:// means you’ve safely connected to
the .gov website. Share sensitive information only on official,
secure websites.
URL of this page: //medlineplus.gov/ency/imagepages/8687.htm
Sense of sight
Overview
Vision occurs when light is processed by the eye and interpreted by the brain. Light passes through the transparent eye surface (the 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, called the 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.
Review Date 7/15/2024
Updated by: Frank D. Brodkey, MD, FCCM, Associate Professor, Section of Pulmonary and Critical Care Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
