I wear a Shoei Neotec with Quiet Ride muffs installed. I fond that, like others, I prefer to fit the crash hat, then worry about glasses. I wear prescription lenses for distance, so, unfortunately, I do wear them while riding. I find that thin wire frames, or thinner plastic ( acetate) frames usually work best. I get all my prescription glasses from Zenni Optical on the web. ( zennioptical.com), and find their service and quality to be on a par with the best of brick and mortar stores. The advantage to Zenni, of course, is price-I don't mind if a pair of glasses I got there does not work for my helmet, I just order up another pair to try. My last two pair of glasses, one an acetate pair, and one an acetate pair with polarized dark lenses, came to $43.00, plus 4.95 shipping. That's for single vision, of course bifocals and progressives are more.