An image of the front of the human eye shows the visible structures of the pupil, iris and sclera. A cross-section image of the eye offers a lateral view of the lens and cornea.
The iris of the eye is the pigmented ring of tissue that gives the eye its color. At the center of the iris is a black circular opening, known as the pupil. Light enters through the pupil to allow an individual to see. The iris constricts and contracts to regulate the amount of light that is allowed into the eye. This produces a dilated and constricted pupil, respectively.
The prominent white part of the human eye is the sclera. It is a leather-like tissue that surrounds the eye and gives it structural shape. The eyes moves in different directions due to muscles attached to the sclera. As the muscles pull on the sclera, the eyeball is moved toward a given direction.
An image of the human eye that allows visualization of the internal structures shows the clear tissue of the lens. Positioned behind the iris and pupil, the lens helps incoming light to focus appropriately on the retina at the back of the eye. In a lateral view, the cornea is seen as a clear layer of tissue that covers the front of the eye.