A peak/brim on my helmets have always been helpful to keep rain off my glasses. I suppose it depends on speed, and how far downward you can tilt your head.

I have advised before that licking the lenses with your wettened tongue might help reduce the formation of droplets, although there will be some distortion after the initial licking. The best is to use your finger (either gloved or not) as a wiper. Ensure you haven't got it contaminated with mud, brake dust or energy drink/bar residues.

I have ridden with glasses all the time. But there have been occasions when I thought contact lenses might be useful. But I have yet to have consistently bad issues with glasses.