A member asked:

Describe difference is between regular and irregular astigmatism?

A doctor has provided 1 answer

Eye curvature: Lenses used by eye doctors to determine your need for refraction and eyeglasses, are based upon regular curves which for astigmatism optically are called toric. If the astigmatism is due to scar and some intrinsic disease like keratoconus, then the curve does not follow the toric pattern and the astigmatism is termed irregular. This may require a hard lens for correction.

Answered 12/6/2012

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