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A member asked:

Astigmatism prescription to spherical prescription, can you tell me more?

A doctor has provided 1 answer
Dr. Tim Conrad answered

Specializes in Ophthalmology

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

4.5k views

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