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The Human Eye

Horizontales
an opening that lets light enter the eye
focuses light on the retina, at the back of the eye
tissue that forms a transparent, curved structure in the front of the eye; refracts light before it enters the eye
Results in the formation of an image in front of the retina because the eyeball is too long
Results in the formation of an image behind the retina because the eyeball is too short
Occurs when the cornea is curved in more than one direction than the other, resulting in fuzzy images
Hyperopic vision is corrected by this type of lens
Verticales
Myopic vision is corrected by this type of lens
When a person ages and the ciliary muscles can't make the lens change shape
carries information from the eye to the brain
muscles that contract or relax to change the shape of the lens
a layer of rod and cone cells that respond to light and initiate nerve impulses; rod cells are very sensitive to light but cannot distinguish between colours; cone cells detect colours
the coloured tissue that surrounds the pupil. The iris can increase or decrease the size of the pupil to control the amount of light that enters the eye