I ended up experimenting this winter after suffering following a long snowshoeing hike during a bright, sunny day at 9k ft.
Got a pair of Cocoons (the Mini Slim), which do look kinda dorky. I have a small face (kids frames fit me except the temples are usually a bit short) and they fit ok but are still a bit wide. The Cocoons don’t come any darker than Cat. 3, which isn’t enough on snow here in the southwest for me (I have very large pupils that don’t constrict as much as others). The Cocoons are, however, great sunglasses for driving, especially around town doing errands (no more swapping glasses) and they have side protection.
Ended up ordering prescription glacier glasses from Opticus. Have to say I am very pleased. Customer service was great, I was able to order different frames to try out, and actually found one pair that fit pretty well (Altice Venture, which comes in 2 sizes). Ordered them with the Blue Tundra (Cat. 4) lenses, which are awesome on snow. For the first time ever, my eyes no longer feel fried. The Venture comes with 2 sets of shields, and the side shields slide & maneuver a bit. They weren’t cheap but they feel like they will last a long time and they weren’t any more expensive that getting rx eyeglasses at a retail store where the frames get marked up a ton. I got single vision lenses and they got the rx perfect.