Astigmatism is a condition that results in blurred, unfocused, or fuzzy vision. The cornea (the front surface of the eye) or lens (located behind the cornea) has an abnormal or irregular curve.

There are two common types of astigmatism:

  • Corneal astigmatism—misshapen cornea
  • Lenticular astigmatism—misshapen lens

Normal Anatomy of the Eye
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The precise cause of astigmatism is unknown. It is often present at birth and may coexist with nearsightedness or farsightedness. Sometimes, it may occur after an injury or eye surgery.