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20/20 vision means you can see from 20 feet away what a person with normal vision can see from 20 feet away. So your eyes are normal.
20/30 vision means you have to be 20 feet away from something a normal person would be able to see at 30 feet away. So your eyes are nearsighted.
20/15 vision means you can see from 20 feet away what a normal person would have to stand 15 feet away from to see. So either your eyes are extremely sharp, or you are farsighted because you have to back further away from a thing to see it clearly.
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