If your glasses fall off then it sounds like a fit or material issue. Rimless titanium wire (hingeless) with polycarb lenses and they'll stay put in the most extreme of conditions with a sensible arm design.
Google "rimless titanium wire hingeless frame polycarb". You'll find plenty. As they're hingeless, you get far superior fit. They weigh much less than standard glasses, as such, they don't slip.
I google those and the ones I see do not look like they would stay on your face if you were upside down, for example (and less extreme positions, of course, but that's easiest to describe).
I wear glasses and contacts, and do sports, and contacts just work a lot better for sports. Glasses are totally fine for sitting at a computer or walking around or driving.
Some of us have high prescriptions which make glasses expensive and horribly unpleasant to wear regardless of frame size or lens choice. I am at -11.5 and with enough astigmatism that modern LASIK isn't an option, id have to get the old "slice a flap off" style. Hard pass.
