A friend who is nearly a scratch golfer told me he overcame "looking up" by taking his right shirt collar between his teeth. (not recommended for golfers with dentures).

I don't mean to be disrespectful, but I believe this is one of those misconceptions that leads to all sorts of trouble. In fact, you have to look up to have a proper follow-through. The trick is to look up at the right time-- not too early, but rather only when the turn of your body requires that you look up (forward). Watch the pros-- they always end their shots with a complete follow through (usually held for several seconds) and their heads looking forward.

Do a google search for "Tiger Woods" photos and you'll see what I mean.