ABSTRACT
Advances in computers and video technology have created the expectation that artificial vision should be realizable. The optical portion of the eye, which puts an image on the retina, is closely analogous to a photographic or television camera. Movement of the eyes is essential to vision, not only allowing rapid location and tracking of objects but also preventing stationary images on the retina, which are essentially invisible. Continual movement of the image on the retina is essential to the visual system. The optical portion of the eye, which puts an image on the retina, is closely analogous to a photographic or television camera. Light enters the eye, passing through a series of transparent layers-the cornea, the aqueous humor, the lens, and the vitreous body-to eventually project on the retina. The cornea, the protective outer layer of the eye, is heavily innervated with sensory neurons, triggering the blink reflex and tear duct secretion in response to irritation.
