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A member asked:

What does -2.5 cylindrical lens power mean?

A doctor has provided 1 answer

Astigmatism: This refers to an ovality of the optical focusing elements of the eye. It is measured by the difference between the steeper and less curved axes and for the prescription mentioned about, that difference is 2.5 diopters which would be incorporated in a corrective lens.

Answered 7/6/2017

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Are there contact lenses for astigmatism of a positive cylinder value?

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I have a cylindrical power of 2.5 in 2014 .Now it was 3. Why it get increased?Will it be a problem?

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