Glossary
(the italic words)
cornea- The window of the eye and is the clear part of the eye, through which the coloured part of the eye is seen. Controls 2/3 of the refraction of light the enters the eye.
lens- controls 1/3 of the refraction of light that enters the eye. Located right behind the pupil. It's main function is to allows for changing of focus from distance to near objects by altering its shape (also known as accommodation).
optic nerve- The nerve that works as the the pathway that the light rays take from the retina to the brain for processing to an image. It is made of around a million tiny nerves bundled together.
pupil- The black spot in the center of the eye. Its size changes to control the amount of light entering the eye and reaching the retina. In the dark it expands allowing more light to enter and contracts in bright light to keep out extra light.
refracted- To deflect (light, for example) from a straight path by refraction. To alter by viewing through a medium.
retina- The membrane that lines the inside wall of the eye. It contains photoreceptors (rods and cones) that converts light into electrical impulses which are sent from the retina to the brain and process into images.
