Astigmatism (eye) (patient information)

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What is astigmatism?

Astigmatism is an eye disorder in which the cornea, the clear tissue covering the front of the eye, or sometimes the lens , is abnormally curved. An abnormally shaped cornea or lens does not allow light to properly focus on the retina, which causes out-of-focus vision.

What are the symptoms of astigmatism?

Although mild astigmatism may be asymptomatic, higher amounts of astigmatism may cause symptoms such as:

• Blurry vision
• Squinting
• Asthenopia
• Fatigue
• Headaches

What are the causes of astigmatism?

The cause of astigmatism is unknown. It is usually present from birth, and often occurs together with nearsightedness or farsightedness. A minor degree of astigmatism is considered normal and does not require correction. Astigmatism is very common.

How to know you have astigmatism?

Astigmatism is easily diagnosed by a standard ophthalmic exam with refraction test. Special tests are not usually required. Children or others who cannot respond to questions can have the degree of their vision problem measured by a test that uses reflected light (retinoscopy).

When to seek urgent medical care

Call for an appointment with the health care provider or ophthalmologist if vision problems worsen, or do not improve with glasses or contact lenses.

Treatment options

Many people have some degree of astigmatism, but those with a small amount of astigmatism do not experience vision problems and do not require treatment.

Glasses or hard contact lenses will correct astigmatism. Soft contact lenses do not work as well.

Severe astigmatism can be treated with surgery.

Where to find medical care for astigmatism

Directions to Hospitals Treating astigmatism

What to expect (Outlook/Prognosis)

Vision is usually normal with the correct glasses or contact lenses.

Sources

http://www.nlm.nih.gov/medlineplus/ency/article/001015.htm