Q:

How does the eye work?

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Quick Answer

According to the American Optometric Association, the eye works by light entering the eye and traveling through the different parts of the eye. Each part plays a vital role in creating a visual image.

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Full Answer

The American Optometric Association details the process of light entering and moving through the eye. When light rays reflect off of an object, they enter the eye through the cornea, which is the clear outer covering that bends the light rays. The rays then pass through the pupil, a small, round hole in the middle of the eye that can grow larger or smaller to allow in more or less light. Surrounding the pupil is the iris, the colored ring of the eye.

The iris controls the size of the pupil. Next, the light rays pass through the lens, which further bends them and focuses them on the retina. The retina rests at the back of the eye and is made up of tissue that contains rods and cones, nerve cells that detect light, motion and color. The rods and cones convert the light into electrical impulses, which then move through the optic nerve to the visual cortex at the back of the brain. A visual image is finally produced in the brain, ending the light's journey and completing the process of vision, notes the American Optometric Association.

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