Dr Alex Hamilton

The eye functions like a camera. When you look at an object, light enters through the cornea and starts to be focussed. The light travels through the pupil and is focussed further by the lens. To achieve good vision the light must come to a clear focus on the retina. From the retina this information is then taken to the brain by the optic nerve. The specific structures in an eye are described below:

The cornea is the front window of the eye.  The cornea is crucially important for allowing good vision because:

It allows light to pass into the eye: therefore it must remain clear

The curved shape of the cornea helps to focus light on the retina