The colored part of the eye; regulates the amount of light entering the eye.
The opening at the center of the iris. The iris adjusts the size of the pupil and controls
the amount of light that can enter the eye.
The clear outer part of the eye's focusing system located at the front of the eye.
The clear part of the eye behind the iris that helps to focus light on the retina.
Allows the eye to focus on both far and near objects.
The light-sensitive tissue lining the back of the eyeball; sends electrical impulses to
The small sensitive area of retina that gives central vision; contains the fovea.
The center of the macula; gives the sharpest vision.
The clear gel filling the inside of the eye.
The bundle of over one million nerve fibers that carries visual messages from the
retina to the brain.
The tough, white outer coat of the eye.
A layer of blood vessels that feeds the retina.
National Eye Institute, USA