What is astigmatism?

Astigmatism

Astigmatism

Astigmatism is an abnormal curvature of the clear outer covering of the eye (cornea), causing blurry vision.

The cornea directs light rays into the eye and focuses them on the light-sensitive retina at the back of the eye. If the surface of the cornea is irregular, light rays may not focus properly on the back of the eye.

Vision problems caused by astigmatism can be treated with eyeglasses, contact lenses, or surgery.

How can you care for yourself when you have astigmatism?

Reduce eyestrain

  • Use good light for reading, work, or study. Use a soft background light plus a light on your task.
  • Choose large-print books. Adjust the print size on your computer and online when possible.
  • Take frequent breaks when you do close work that can be hard on your eyes. Blink often. Every 20 minutes, look at something 20 feet away for 20 seconds (the "20-20-20" rule). Close and rest your eyes when they feel tired or dry.
  • Avoid glare on TV and computer screens. Place your TV or computer screen where lights do not reflect on the screen. Some people find it easier to work on a computer in a dimly lit room. Special nonglare screens that fit over the computer screen also may help.

Keep your eyes healthy

  • Have eye exams as often as your doctor recommends.
  • Wear sunglasses to block harmful sunlight. Buy sunglasses that screen out ultraviolet A and B (UVA and UVB) rays.

Astigmatism: When to call

Watch closely for changes in your health, and be sure to contact your doctor if:

  • You have vision changes.
  • You have any problems.

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The content above contains general health information provided by Healthwise, Incorporated, and reviewed by its medical experts. This content should not replace the advice of your healthcare provider. Not all treatments or services described are offered as services by us. For recommended treatments, please consult your healthcare provider.