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How many times did your mother tell you not to stick your finger in your eye? Did you listen? No; you stuck your finger in your right eye. Now look what happened.

edit: Oh, and the vision in...

I believe that 20/20 means you can see at 20 units of distance what you should be able to see at 20 units of distance.

I've never seen three numbers written though. Perhaps it means you can see...