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As part of
the body's normal aging process, a cataract is the
gradual clouding of the natural, focusing lens of the
eye. While cataracts cause no physical pain or
discomfort, they frequently reduce a person's ability to
see clearly and to recognize colors. For many
people, the world around them becomes a hazy blur. |
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In its early
stages, a cataract may not cause a problem. The
cloudiness may affect only a small part of the lens.
However, over time, the cataract may grow larger and
cloud more of the lens, making it harder to see. Because
less light reaches the retina, your vision may become
dull and blurry. A cataract won't spread from one eye to
the other, although many people develop cataracts in
both eyes. |
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The lens is
made mostly of water and protein. The protein is
arranged to let light pass through and focus on the
retina. Sometimes some of the protein clumps together.
This can start to cloud small areas of the lens,
blocking some light from reaching the retina and
interfering with vision. This is a cataract. |
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Although
researchers are learning more about cataracts, no one
knows for sure what causes them. Scientists think there
may be several causes, including smoking, diabetes, and
excessive exposure to sunlight. |
