The lens focuses light through the vitreous humor, a clear gel-like substance that fills the back of the eye and supports the retina. The retina receives the image that the cornea focuses through the eye's internal lens and transforms this image into electrical impulses that are carried by the optic nerve to the brain.
The human eye is an organ which reacts to light and pressure. As a sense organ, the mammalian eye allows vision. ... Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth.