Astygmatism And Contact Lenses
A debate continues as to whether astygmatism
and contact lenses are compatible bed fellows. For many
years, it was unclear as to whether contact lenses of any sort could
assist an astigmatism sufferer.
Astigmatism is a misshaping of the the cornea.
A normal cornea is round, but in an astigmatism sufferer, the shape
is more like an American football, or rugby ball. An astigmatic
eye sees light focusing on two points in the back of your eye, rather
than on just one in a normal eye. This is because an astigmatic
cornea has a steeper and flatter curve due to the shape of the cornea.
This is called corneal astigmatism.
Sometimes, astigmatism is the result of an
irregularly shaped lens, which is located behind the cornea. This
is called lenticular astigmatism.
Either kind of astigmatism can usually be
corrected with spectacles or contact lenses. In some case, refractive
surgery can also help astigmatism sufferers.
Astigmatic Symptoms
If you have only a small amount of astigmatism,
you may not notice it or have just slightly blurred vision. You
may have had the problem for many years but never noticed, because
small changes over many years may not have indicated a problem to
you. However, uncorrected astigmatism may also give you headaches
or a pain behind the eyes, which you might think of as eyestrain.
Or, you may notice distorted or blurred vision at all distances.
Astigmatism can also affect children. Astigmatism
can affect their ability to see properly in lessons, so it's vitally
important that children have their eyes examined at regular intervals
in order to detect any astigmatism early on. I personally started
complaining to my parents when I was about 8 that I could not see
the blackboard at school properly. I was taken to doctor, who advised
my parents that I was just trying to get out of school. My continued
complaining however, eventually led my parents to find the only
optician in town (this was some years ago) who confirmed short sightedness
and astigmatism.
I would certainly hope that my children get
a more sympathetic ear from the medical profession then I did all
those years ago.
Treating Astigmatism
Unless it is extreme, astigmatism can be treated
with glasses or contact lenses.
Many people with astigmatism believe that
they can't wear contact lenses at all, which is something that was
alluded to at the start of this article, or that only hard (also
called gas permeable - GP) contact lenses can correct astigmatism.
For many years, this was the case, but now
there are soft contact lenses available, that correct astigmatism.
These are called toric contact lenses.
Toric lenses have a special correction built
into them and may also contain a prescription for nearsightedness
or farsightedness if you need it.
While soft toric lenses work well for many
people, if you have severe astigmatism, you might find that GP contact
lenses or spectacles help you more. Your optician will be able to
advise you.
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