My eyesight isn't that horrible so if it is raining I just go without glasses. I put them in my bag in a crush-protected zone. I can see well enough to notice big metal objects nearby and can distinguish red from green. Reading street signs is a little fuzzy but I basically know where I'm going most of the time.
I don't know how the prescription goggles would help the situation though--still going to have to deal with the water drops all over them.