The cornea, which is the eye's outer layer, aids in focusing and transferring light from the lens to the retina.
Nearly 40% of the general population has diabetes, which can impair every organ in the body.
Retina is the light receptive screen of the eye (akin to the screen in the camera) that sends visual messages to the brain through the optic nerve.
Ocular motility is tested when patients complain of double vision or if neurologic disease is suspected.
RGP: Lenses are semi-rigid and often constructed of fluorosilicone and acrylate, a plastic that allows oxygen to reach the eye.