What does the 20 in 13/20 mean?!

Question: What does the 20 in 13/20 mean.?

i had to get a physical before school this year, and my doctor said my vision was 13 over 20...what does that mean.?.?Health Question & Answer

Answers:

That you are near sighted. You can see at 13 feet what a "normal" person would see at 20 feet. Health Question & Answer

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What does the 20 in 13/20 mean?!

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