Explain the structure of an eye with a diagram.
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The eye is almost globular in outline; its thickness=2.3 cm. The
external part of the eye is reasonably strong, white in color and is known as
sclera. The crystal clear anterior outer casing of the eye is referred to as
cornea. At the back of cornea is the tinted membrane known as iris; the iris
not only controls the quantity of light going into the eye but also delivers
color to the eye. In the iris is a black rounded hole known as the pupil, the
size of which is regulated by the iris. At the back of the pupil is the lens
which is denser in the center and serves to assemble the light rays falling on
it. The lens concentrates this light on a slender layer of nerve cells called
the retina.
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