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diverging lens
short sighted eyes corrected with...
converging lens
long sighted eyes corrected with...
near point of normal eye
far point of normal eye
To focus light onto the photosensitive surface at the back of the camera. This can either be photographic film or a CCD (charge-coupled device).
Focusing screw
Allows the user of the camera to adjust the focus for nearer or more distant objects.
Allows the user of the camera to adjust the amount of light entering the camera in different light conditions
Photosensitive surface
Detects and records the light which is focused onto it. This can be on photographic film, but digital cameras use CCDs which convert light into electrical signals which can be stored.
Front part of the tough outer coat, the sclera. It is convex and transparent
Pigmented - decides the colour of your eyes - so light cannot pass through. Its muscles contract and relax to alter the size of its central hole or pupil.
Transparent, bi-convex, flexible disc behind the iris attached by the suspensory ligaments to the ciliary muscles.
The lining of the back of eye containing light sensitive cells
Optic nerve
Bundle of sensory neurones at back of eye.
refracts light - bends it as it enters the eye
controls how much light enters the pupil
focuses light onto the retina
contains the light receptors
optic nerve
carries impulses from the eye to the brain