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According to the champion information page for Teemo (link below), his blinding dart should have a range of 680.
However, in game this is not true. I've played numerous games with Teemo and I know that I can't even get a blind off on Ashe, who has a range of 600, without her auto-attacking me first. If anything, the actual range is 580.
TEST IT FOR YOURSELVES: mark your distance where you can use blinding dart on golems and compare the distance with which Ashe or Caitlyn can autoattack the golems. It's definitely smaller than Caitlyn's range, which is 650.
So, I'm asking that you either change the value on the page below, or give Teemo the range on his blind that he deserves (the latter being preferred ).