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A member asked:
What is the prescription for people with 20/400 vision?
A doctor has provided 1 answer
Depends: There is not a direct correspondance between 20/400 vision (the big e on the charts), and the values needed to correct it. It will be a combination of + or - power along with some degree of astigmatism. You need an ophthalmologist to determine the exact correction.
Answered 1/24/2013
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