Is it possible to get prescription glasses if you have 20/2100 vision? Yes, that's 20 over two thousand one hundred. - Quora
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Fashion Ultralight Myopia Glasses Round Frame Myopic Eyeglasses Men Women Unisex Minus Diopter 0 -1.0 -1.5 -2.0 -2.5 3.0 3.5 4.0 - AliExpress
Can you tell if a person is wearing minus or plus glasses just by you taking a look at them? - Quora
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