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Contact Lenses For Astigmatism
By Cathy Peterson
For many years, people with astigmatism were told that they could not wear contact lenses to
correct their vision. Now, not only can astigmatism be corrected with special contact lenses called
torics, but wearers have a choice across a broad range of materials, brands, and replacement
schedules. They even come in colors.
First it helps to understand what astigmatism is. Astigmatism occurs when part of your eye (usually
your cornea, though other types exist) is oval instead of round. This leads to problems with the way
that light and images are reflected through to the back of your eye, or retina, where nerve endings
translate those light waves into the images or pictures that you see. The result is that people with
astigmatism are neither nearsighted nor farsighted, but have blurry vision whether things are close to
them or far away.
The way that contact lenses correct this is that they are round and cover the oval shape of the cornea.
This way, the eye gets its signals from the properly shaped contact lens instead of the misshapen
cornea. Toric lenses have two types of correction in them, one to correct for the shape of your cornea,
and the other to correct for either nearsightedness or farsightedness. Because they have some rigidity
and thus keep their shape easily, your eye care professional may suggest gas permeable (GP) lenses
if your astigmatism is pronounced. Conversely, very mild forms of astigmatism may be corrected with
regular, non-toric lenses. If your level of astigmatism falls somewhere in the middle,