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Do you mean for eyesight?

20-20 vision is average vision of human what he can see normally from 20 feet away as a standard.

If 20-40 vision, that means you have to stand 20 feet away from an object that the average person can distinguish from 40 feet away.

If 20-15, that means you can stand 20 feet away from an object that the average person can distinguish from 15 feet away.

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Q: 20 20 stands for what?
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