Lens correction: It is most likely the power of the lens correction you require. Either + 3.50 (farsighted, hyperopic) or -3.50(nearsighted or myopic).
Answered 12/17/2020
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350: The number may mean several things. 20/350 may refer to your vision without glasses. -3.50 may be your prescription strength, the degree of myopia or nearsightedness. Ask your eye doctor for more details if you are unsure.
Answered 2/14/2021
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