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Eye Anatomy
How We See
 The
miraculous process of sight occurs when the eyes and the brain work
in harmony to transform light images into sight. Light rays first
pass through
the transparent
cornea, which focuses them through the
pupil to the
lens. The lens is made of clear, flexible gel
surrounded by the transparent lens capsule. When light rays reach
the lens, it adjusts its shape to fine-focus back of the eye. Once
the retina has received the light images, it translates them into
electrical impulses. The
optic nerve carries these impulses to the
visual cortex of the brain, where they are interpreted into sight.
 When
any part of the visual system is not working properly, the process
of sight can be interrupted. One of the most common problems which
can affect
vision is a cataract. Almost everyone who lives a long
life will eventually develop cataracts.
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