Astigmatism

Astigmatism is an uneven curvature of the cornea that causes light rays to focus at multiple points within the eye, distorting vision. Astigmatism often occurs in combination with near or farsightedness.

Astigmatism Overview

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Symptoms of Astigmatism

With astigmatism, the eye cannot focus clearly at any distance and will have difficulties seeing fine details. Objects with vertical lines, such as walls or buildings, may appear to tilt.
EYEBALL-Normal
Normal Vision: Light rays pass through the cornea to merge and focus perfectly on the back surface of the eye, called the retina, producing clear vision.
EYEBALL-Astigmatism
Astigmatism: Because the cornea is irregularly shaped, light rays focus at multiple points within the eye and distort vision. The astigmatic eye cannot focus clearly at any distance. Astigmatism often occurs in combination with near or farsightedness.

Possible Causes of Astigmatism

Astigmatism is often hereditary, but may go unnoticed until the problem worsens with age. Other common causes include:

  • Past eye surgeries
  • Eye injury resulting in scarring of the cornea
  • Keratoconus, a disease that distorts the shape of the cornea

Treatment of Astigmatism

Several treatment options can help correct an astigmatism. We’ll determine the right one for you. Some options include:


Get EyeSmart

Visit the American Academy of Ophthalmology’s webpage on Astigmatism.