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20/40 is a measurement of visual acuity (how sharply you see). Read on to learn about the meaning behind the numbers and whether 20/40 vision is “bad.”
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20/20 means that you are able to see on an eye chart at 20 feet
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再入荷 Timer 20 【¥20,000値下げ中!】デロング twenty ワッペン入り Wikimedia スタジャン Commons レッド ジャケット/アウター