The eye acts like a camera system. There is a system of lenses (cornea and eye lens), a diaphragm (pupil) and a light-sensitive photographic plate (retina). The eye lens and the cornea are both responsible for refracting incoming light rays. Proper light refraction allows the rays of light to converge on the retina. The light is then registered by millions of light-sensitive cells and transformed into electrical signals. These signals are transferred to the brain via the optical nerve; the brain then creates a perception.
