I need prescription varifocal sunglasses. Wrap-around style. And I'd like them to either be bombproof, or else have a cheap frame which can be replaced. DH bought a pair of Oakleys in duty free once when we went snowboarding. Got off the top of the first lift, hit ice, fell on them and broke them. 
Went into Vision Express today to have a poke round, and the only sporty type sunnies are Oakley, the rest are all fashun. So I guess that means I should be going elsewhere. But where?
Any recommendations?