My old glasses slid down constantly unless they were propped up by my n95. "Don't worry," said the fitter at the optometrist's office. "I'll make it so your new glasses don't slip and won't hurt your ears."
And she did exactly that. Unfortunately, it turns out that keeping my glasses in one spot on my nose all day is actually pretty painful to my nose! Even with silicone nose pads!
I'll keep tweaking these nose pads but I think the solution will be to bend the temple arms so that they let my glasses slide down again.
If anyone has any magic to share, do comment!