What
are Cataracts?
A cataract is a clouding of the eye's natural lens, which lies
behind the iris and the pupil. The lens works much like a camera
lens, focusing light onto the retina at the back of the eye. The
lens also adjusts the eye's focus, letting us see things clearly
both up close and far away.
The lens is mostly made of water and protein. The protein is
arranged in a precise way that keeps the lens clear and allows
light to pass through it.
As we age, some of the protein may clump together and start
to cloud a small area of the lens. This is a cataract, and over
time, it may grow larger and cloud more of the lens, making it
harder to see.
Researchers are gaining additional insights about what causes
these specific types of proteins (crystallins) to cluster in abnormal
ways to cause lens cloudiness and cataracts. Recent findings suggest
that fragmented versions of these proteins bind with normal proteins,
disrupting normal function.
Cataracts are classified as one of three types:
A subcapsular cataract begins at the back of
the lens. People with diabetes, high farsightedness, retinitis
pigmentosa or those taking high doses of steroids may develop
a subcapsular cataract.
A nuclear cataract is most commonly seen as
it forms. This cataract forms in the nucleus, the center of the
lens, and is due to natural aging changes.
A cortical cataract, which forms in the lens
cortex, gradually extends its spokes from the outside of the lens
to the center. Many diabetics develop cortical cataracts.
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Treatment
When initial symptoms begin to appear, you may be able to improve
your vision for a while using new glasses, strong bifocals,
magnification, appropriate lighting or other visual aids.
Surgery should be considered when your cataracts have progressed
enough to seriously impair your vision and affect your daily life.
Many people consider poor vision an inevitable fact of aging,
but cataract surgery is a simple, relatively painless procedure
to regain vision.
During surgery, we will remove your clouded lens and in most
cases replace it with a clear, plastic intraocular
lens (IOL).
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