Growing up you heard "the eye focuses light and works like a camera". True. Light enters through the cornea, the "window of the eye." The rays of light travel through the pupil to the lens; the lens fine tunes the focus of light onto the retina. The retina turns light into electrical impulses that travel to the brain which interprets the image it receives.

When the light rays coming into the eye aren't focused properly, the eyes need correction. This correction traditionally comes through glasses or contact lenses. Now, laser vision correction offers a more permanent solution.