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Recently, I replaced my 1.61 index lens with 1.67 and the prescription is the same. But after that, I felt some strain in my eyes. Is this a lens quality issue? - Quora
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Should I get 1.59 index lenses or 1.60 index if my OD is -4-1x81 and my OS is -3.5-.75x120? - Quora
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