Too bad you can't wear contacts anymore, it's really the way to go for snowboarding (unless you can afford laser eye surgery)
As far as goggles over the glasses are concerned, check out the OTG Goggle by Smith. I haven't used it because I have contacts, but it gets great reviews.
Aren't you worried about when your goggles go flying off during a big tumble that your glasses will too?
I've been debating between OTG Goggles or some sort of large coverage prescription active shades. Couple months left to decide. Or bite the bullet and go back to trying contacts. I tried a few years back and spent weeks trying to force the fuckers into my eyes...never got them in. I can fling myself down a mountain, but I can't force my own eye to stay open.
Any thoughts on how well some prescription shades would do? Not traditional goggles, but I've been wearing just my normal prescription glasses that last couple seasons without having died.
I find shades won't cut it in high winds at those sub-zero temps - the nasty nights that give you the boogercicles from your nose. I need skin protection, not just eye protection.
Might I HIGHLY recommend you get OTG goggles with the little battery power fan built in. Your glasses don't have anti-fog coating, unless you're willing to rub on cat-crap every few runs, but I've got no idea what that does to precription lens coating. The atmosphere inside your goggles gets real humid real quick.