The Eye : The Classical World

Introduction

Like a movie camera, the eye is made up of special structures, which work together to produce a continuous picture i.e., to enable sight.

Light enters the eye through the transparent part of the tunic, the cornea, and passes through the pupil, lens, and vitreous to the sensory receptors in the retina, from where the optic nerve – a sensory nerve – conveys it to the ophthalmencephalon, the part of the brain that deals with vision. Vision is also facilitated by motor nerves that control the movement of the eyeball and eyelids, the size of the pupil, and the focus of the lens.