What does it mean to have 40/40 vision?!

Question: What does it mean to have 40/40 vision.?

I have 40/40 vision, what does that mean. Health Question & Answer

Answers:

you can see items 40 feet from where you are.
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I get that when I drink a Colt Malt Liquor "40"....Health Question & Answer

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What does it mean to have 40/40 vision?!

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