Maybe some of those goofy safety glasses that go over your prescription glasses, with Rain-X?

Rain-X works really well on motorcycle helmet face shields, but it kind of leaves haloes all the time, so I don't use it unless I know I'll be riding in rain. I don't think I'd want to use it on prescription glasses (never mind I'm not sure if it's safe for some of the expensive coatings they use).

Goggles with tear-offs?