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1 = Cornea. The clear tissue that makes up the front
of the eye. Normally clear, like glass,
the cornea does 2/3 of the focusing work.
2 = Iris.
The colored part at the front of the eye; some are brown and some are blue. The iris regulates the amount of light
entering the eye.
3 = Natural Lens.
The lens does 1/3 of the focusing work. Until the age of 40 years, or so,
the lens changes shape put things into focus.
Typically clear at birth, with age the lens becomes cloudy (opaque) – this
is referred to as a “cataract.”
4 = Retina.
The lining of the inside of the eyeball.
The retina converts images (tiny pictures of real objects) into chemical,
and then electrical, signals, which are then sent to the brain.
The brain processes these signals and makes sense of it all – vision occurs
in the brain.
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