Astigmatism is a common condition where fails to focus uniformly on the retina. This uneven focus causes blurred or distorted vision at all distances. It occurs as a result of the curvature in the lens or when the cornea is not shaped as it should be. Astigmatism may occur with two other similar refractive error conditions; myopia and hyperopia.

An irregularly shaped cornea or lens will prevent light from focusing correctly on the retina. The vision then becomes blurred or distorted at any distance. A normal eyeball is supposed to take the shape of a round ball, not a football. A diopter (a unit of measurement of the refractive power of a lens) measures astigmatism. A measurement of 1.5 or more means the individual needs glasses or lenses for clear vision. The average diopters measurement in most people ranges from 0.5 to 0.75.


  • Regular: The cornea is curved more in one direction than the other. 
  • Irregular: The curvature of the cornea is not even.


Signs & Symptoms

  • Strain in the eye
  • Headaches
  • A distorted or blurry vision
  • Discomfort in the eye
  • Squinting