INFORMATION ON EYE CONDITIONS
The eye has been called the most complex organ in our body. It's
amazing that something so small can have so many working parts.
But when you consider how difficult the task of providing vision
really is, perhaps it's no wonder after all.
The eye is like a camera. It lets light in through the cornea,
which is like a camera's aperture. The amount of light allowed in
is controlled by the pupil, which opens and closes a bit like a
shutter. The light focuses on the retina, which sends the image
to the brain, acting as film would in order to record the light.
Other elements of the eye anatomy support the main activity of
sight: Some carry fluids (such as tears and blood) to lubricate
or nourish the eye. Others are muscles that allow the eye to move.
Some protect the eye from injury (such as the lids and the epithelium
of the cornea). And some are messengers, sending sensory information
to the brain (such as the pain-sensing nerves in the cornea and
the optic nerve behind the retina).
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