I have progressive bifocal (Maui Jim Ti framed) sunglasses, and wear them for all purposes, including cycling. If I'm outside and it's not night, I have my sunglasses on. I can look below them to read my computer, which is more a brightness issue than a focus issue.

I'd love a pair of nifty cycling specific wraparound Rx sunglasses, but I'm not too keen on having lenses glued onto the back of the sunglasses, which seems to be the only way to get the overall coverage you want for cycling, while also having correction. You'd think it would be possible to engineer glasses that provided proper correction while allowing more curvature...