Just an FYI ... I wear eyeglasses and have (for many years) been planning on getting some prescription sunglasses. I still haven't done it yet, for some reason.
I've tried two or three pairs of sunglasses that fit over my regular glasses, but the execution was never quite as good as the idea ... gouged ears, pinchy nose, etc
On Wednesday I tried on a pair of Cocoons (they come in many sizes) at a local shop and BAM found a pair that fit and work perfectly. Totally impressed, I bought one pair and ordered a second. They're $46 (Canadian) or (US)$40
Check their website.