Found at 2FlashGames
Update 2/12/08: Neatorama reader Concerned Nerd told us it's from a T-shirt design on Off World Design.NEW FEATURE: VOTE & EARN NEATOPOINTS!
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Your supposed to be 20 feet away no matter what. to read these charts you take the smallest one you can read, and the bottom number of that one is how close most people have to be in order to read it so like 20/15 means you see at 20 what most see at 14 etc