Part one of term paper
? The human eye does alot more than allowing you to see. It is very complex and has many parts and features which can have defects. However, to understand defects you must first know how the eye works. First light passes through the cornea, which is the transparent part of the sclera, or white of the eye, which is composed of tough fiberou ...

Part two of term paper
... iris contols how much light is allowed to enter your by opening up further when it is dark and closing up more to block out some light when it is bright. Everything that passes through the pupil, which looks like a black dot, is what you see. Next the light passes through the lens. The lens focuses the light rays onto the retina forming an image in reverse and upside-down. Finally light- sensitive cells in the retina transmit the image via the optic nerve to the brain by electrical signal ...