Cenveo - Drawing The refraction of light through the cornea and lens - English labels

The refraction of light through the cornea and lens. When light moves from one medium (such as air) into another medium (a) (such as the cornea or lens (b)), any rays not entering at a 90 degree angle will be refracted, or bent. Because both the cornea and lens have curved surfaces, they refract some of the light rays entering the eye. In doing so, they compress the image of what we see so that a large amount of visual information can be processed by a small amount of retinal tissue. The cornea refracts more light than the lens does because its surface is more curved, but the lens has the ability to change its shape, and therefore fine-tune the amount of refraction necessary to focus the light rays on the retina. This process is known as accommodation. English labels.