I just let my glasses get wet. I haven't found that wet glasses are that big an impediment to seeing.

As for LASIK/not wearing, I'd wear safety glasses if I didn't need prescription glasses. My glasses I'm wearing now have a significant ding in close to the nose on the right lens from a rock thrown up by a car tire a few days ago. Without the glasses at best I'd be looking at damage to the eye at best, it could have caused me to fall at worst and that could have put me in the path of a car (most of the roads I ride on have cars doing 50-60 MPH).