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.
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.