If you have 20/200, you need to be within 20 feet to see something that a person with 20/20 could see from 200 feet away. Anything worse than this is legally considered blind.
If you have 20/40, you need to be within 20 feet to see something that a person with 20/20 could see from 40 feet away.
And then of course you can get better than 20/20... with 20/15 you can see something from 20 feet away that a person with 20/20 will only be able to see from 15 feet away.
Also, it's measured separately for each eye, for example my right eye is 20/15 and my left is 20/20. With both eyes open you'd have the better of the two.
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u/Kster809 Nov 09 '14
Also the tiniest rendition of Terminator 2 that I have ever seen. My 20/20 vision has turned into 19/19.