Prescription Sunglasses for Cyclists
I love my Oakley Fives. 

Pros:


The frames are relatively cheap
They're very light and comfortable to ride in
They provide good coverage and keep out dust/grime and breeze
The arms are designed to detach when under pressure rather than break
I think they look good


I have transition lenses and they are fantastic. I never have to worry about changing lenses or having the wrong tint. I just chuck them on and go and they're always spot on.