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Astigmatism (Astig)



Astigmatism creates distortion, or warping of the optics in the eye. This is caused by the cornea not being entirely a perfect hemispherical curve. It is instead shaped like a rugby ball, thereby having 2 different curvatures. This in turns causes light rays to focus at 2 different positions in the eye.

 

Astigmatism is not uncommon, and can occur on top of Myopia and Hyperopia, or as a refractive error on its own. Low degrees of Astigmatism may be hardly noticeable, but high amounts will cause distortion and blur.

 

Spectacle lenses and certain types of contact lens are able to correct Astigmatism and bring about the defocused light rays into unison onto the retina.