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!?!?Www@Answer-Health@Com

Answers:

That you are near sighted!. You can see at 13 feet what a "normal" person would see at 20 feet!. Www@Answer-Health@Com

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What does the 20 in 13/20 mean?!

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