How we see

The miraculous process of sight occurs when the eyes and the brain work in harmony to transform light images into sight. Light rays first pass through the transparent cornea, which focuses them through the pupil to the lens. The lens is made of a clear, flexible gel surrounded by the transparent lens capsule. When light rays reach the lens, it adjusts its shape to fine-focus the images onto the retina which covers the back of the eye. Once the retina has received the light images, it translates them into electrical impulses. The optic nerve carries these impulses to the visual cortex of the brain, where they are interpreted into sight.

When any part of the visual system is not working properly, the process of sight can be interrupted.