Quote Originally Posted by Biking Chick
In rain conditions I've found that using Rain-X helps to keep the rain from spotting on the lenses.

You can find Rain-X in just about any automotive department at your favorite Target or local automotive store. (Used on windshields to keep water moving off the windshield).
Nice one Biking Chick - that's a top tip. Would never have thought of that S'pose I ought to wear eye protection in the rain really- just in case.