I wear my contacts and my beloved Rudy Project (Rudy Girls) sunglasses. I have clear lens to go in them that snap in and out easily that I carry in my saddle bag all the time. In case of changing light conditions etc. Lens come in a variety of colors, break-age strengths... and rx correction.

I can't ride anyway now since my crash, but I *wish* I had the rx sunglasses inserts for my Rudy's as a back-up. Blood in the eye, so been wearing my one pair of regular non-sport specific glasses. And I get migraines trying to drive in the sunlight. So, for sunglasses now, I have some $15 clip on deals from Walmart optical. Think my regular specs have gotten a couple lens dings from them. Ick.

I think Oakley brand might offer this option for rx inserts for sport sunglasses too.

Just an idea as carrying the snap in lens only is much smaller and lighter to deal with. And versus the risk of losing the other set of glasses in whole if they fell outta the jersey pocket etc.