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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.”
How do I read my visual acuity results? - easee %
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20/20 Vision and Understanding Your Visual Acuity Score - North
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Visual acuity - Wikipedia
What Does 20/40 Vision Mean?
What is 20/20 Vision?
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What is 40/20 eye vision? - Quora
20/20 Vision. 20/10 Vision. 20/40 Vision. What do all these