As much as I love specs, sunglasses are a constant hassle for me. I never know what the right thing to do is when I live in a country with only a few weeks of serious sunlight.
Prescription sunnies as pricey, so I usually get a pair glazed with transitions so they're dual purpose. Thats expensive too though, and I much prefer having clear lenses on the whole. Thankfully now we've designed our own I'm able to grab 'the dream' and have a pair of clips ons custom made. Hopefully they'll come in the next few weeks. By no means are clip ons cheap, but they're so much better for me than the alternatives.
In the meantime I have a pair of clears and katy got some transitions made up which look good because transitions never seem to go super dark.