What Is Astigmatism by anamaulida


									Astigmatism is a condition of the eye where light rays are not focused
equally on the back (retina) of the eye. It is usually associated with
either myopia (nearsightedness) or hyperopia (farsightedness). The eye
has two basic components, the optical and the sensory. It is very much
like a camera. In a camera there are lenses that focus the light rays
onto the film which then converts light energy into chemical energy. Same
for the eye except the film is replaced by the retina. The retina sees
and stores images and shapes like film does. Nearsightedness is when the
optical elements of the eye are too strong and light rays are focused in
front of the retina. You can see at near clearly but not far.
Farsightedness is the opposite, the optics of the eye are too weak and
the eye must use additional focusing power to see clearly. This causes
eye fatigue especially when reading.Most people have some amount of
astigmatism. It comes either from the front part of the eye, the cornea,
not being perfectly round but slightly oval in shape and/or the lens
inside the eye being slightly oval as well. You can not see this oval
shape with the naked eye as it is very slight. Imagine taking plastic
lens out of a pair of glasses and squeezing it until the shape changed,
you would be creating an astigmatic condition. The result would be that
some of the light rays would elongate and others might shrink.The
treatment for astigmatism is either glasses or contacts. If you choose
contacts you can go a step further with correcting the astigmatism by
using toric lenses. LASIK can also correct astigmatism. Uncorrected,
astigmatism can cause eyestrain which may manifest itself in headaches or
discomfort while reading or driving. The effects are not harmful nor
permanent, just annoying.

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