What is Astigmatism?
Astigmatism is a vision problem that causes objects to appear distorted and blurry. It often affects both distance and near vision. It is the most common vision problem and it may occur with nearsightedness and farsightedness.
Signs and symptoms of Astigmatism
Astigmatism usually causes vision to be blurry at distance as well as near. Patients with astigmatism often feel tired after reading and find that letters and words appear to be slanted. Squinting and tilting the head seems to improve vision distortion caused by astigmatism.
Causes of Astigmatism
Astigmatism is caused by the cornea having an oblong shape, like a football, instead of spherical shape, like a basketball. A cornea with astigmatism has two curves, one flat curve and one that is steep. Light is then focused at two points instead of one. One point of focus may be in front of the retina and the other behind. This causes images to appear distorted in addition to appearing blurry. Astigmatism may also be caused by an irregularly shaped crystalline lens. This condition is termed “lenticular astigmatism.”
Astigmatism is diagnosed by an eye examination with your optometrist who may also measure the curvature of the cornea for more detailed measurement of astigmatism.
Treatment of Astigmatism
Astigmatism may be corrected with glasses, contact lenses or surgery.
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