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Help me figure out how thick my eyeglass lenses will be. - glasses prescription index | Ask MetaFilter
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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TEE 1.61 MR LENS – High index MR monomer Lens SP and ASP design – Optical Lens Manufacturer in Korea
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