I know it's a common stereotype but it seems to have a basis. Almost all of the smart people I know wear glasses (or sometimes contacts). I have seen stupid people get glasses, but they never keep them for more than a few days, and the glasses tend to be pretty weak to begin with. In fact, it almost seems like the smarter people are, the worse their eyesight is. With the exception of one person, all the really smart people I know are practically blind. Now given, some of these people are middle-aged, but some of them are teenagers too! And I can honestly say I've never met a stupid person who can't see.
So what's going on here? Does anyone know where to find research or articles, or maybe have a hypothesis themselves?