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A member asked:
Astigmatism prescription to spherical prescription, can you tell me more?
A doctor has provided 1 answer
Yes: The spherical equivalent to a sphere plus astigmatism prescription is obtained by adding half of the amount of astigmatism to the sphere. This number can be used to calculate the contact lens prescription of a low astigmat, typically a diopter or less of astigmatism.
Answered 2/4/2014
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