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Home > Eye
conditions > Astigmatism
Astigmatism
What is Astigmatism?
Astigmatism is a variation or
disturbance in the shape of the cornea.
When an astigmatic person looks at the spokes of a wheel,
some spokes appear clearer than others. Because only parts
of the image are correctly focused, distortion is caused
at all distances.
Astigmatism is one
of a group of eye conditions known as refractive errors.
Refractive
errors disturb the way that
light rays are focused within the eye. Astigmatism often
occurs
with short sight or long sight, about half of glasses wearers
have this added problem.
Causes of Astigmatism
Astigmatism is caused by an unevenly shaped cornea (like
a rugby ball). The uneven (oblong) shape causes the rays of
light to focus on two points on the retina, causing distortion
and blurring of images.
Diagnosis of Astigmatism
Common symptoms of astigmatism include
• Blurred or distorted images
at all distances
• Headaches
• Squinting and eye discomfort or irritation
Eye tests and examinations will diagnose
whether you have astigmatism and measure the severity. Astigmatism
is shown on your glasses prescription in the box marked
CYL. and is measured by the strength of
a cylindrical lens needed to achieve correct vision.
Treatments for Astigmatism
Astigmatism can be corrected with glasses, contact
lenses, refractive laser surgery
and Implantable contact lenses.
Astigmatism can be corrected by soft
contact lenses as well as hard contact lenses. Contact
lenses for astigmatism are known as
toric
lenses.
It is worth discussing with a doctor
the best form of correction or treatment for astigmatism
to meet your needs and lifestyle.
If you are considering Refractive surgery
to correct astigmatism, then click
here to read our
guide to laser eye surgery and Implantable Lenses.
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