So, this happened the other day.
I tried gluing them, but (true to my usual experience with crazy glue) just ended up gluing my fingers together, and at one point had the frame of one piece glued to my thumb. (I also ended up with glue in one eyebrow and I can't even begin to figure out how that happened.)
I finally gave up and asked my dad for help. He held the parts together while I tried to squeeze some glue.
"Just a drop," he kept saying - "Just a drop!"
"Dad, I can't see it without my glasses..."
Unfortunately (but not unexpectedly), the repair was impossible, since the bridge piece is just too thin to hold together with glue. I'm overdue for a new prescription, so I'll be off to the eye doctor, but the earliest appointment they had wasn't for a couple of weeks.
So, cheap Walmart readers to tide me over. Far from perfect, but at least I can read a computer screen. (I just have to remember to take them off when moving around - the vertigo gives me nausea.)
I'll probably take another stab at fixing my real glasses, now that I can actually see them again. Some kind of splint across the bridge, to fasten the halves to... Yeah, that could work...
Wish me luck!