Not very: Prisms shift the visual image between the two eyes to eliminate doubling of vision and eyestrain. A 1.5 diopter level is modest but can be useful. No matter what the strength, if it helps the problem, then you should be comfortable with the result.
Answered 9/22/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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