The lens of the human eye works on the same basic principle as the lens of a camera. Muscles that attach to the lens allow it to change shape and shift the focus of the light rays that are projected onto the retina.
Human eyes depend on many components in order to function. Light first passes through a transparent protective covering, known as the cornea, before making contact with the lens. By changing the shape of the lens, eyes are able to focus on objects at different distances. Light is then projected onto the retina, located at the back of the eye.