Basic Anatomy of the Eye
Use your mouse to find parts of the eye anatomy.
Light enters the eye through the cornea, then through the pupil, along through the lens and the vitreous humor, finally hitting the fovea and surrounding retina. The image information is carried to the brain to interpret along the optic nerve.
Both the cornea and the lens refract light, bending it to focus an image at the back of the eye. However, the lens is accomodating. It can change shape to bring the object of interest into focus.
How does this accomodation come about? The lens is an elastic material. When the muscle of the ciliary body pulls on the lens, it changes shape, becoming flattened out. This brings distant objects into focus. When the cilliary muscle relaxes, the lens rounds out, bringing closer objects into focus.