During this winter when shopping, my wife (who doesn’t need glasses except to read) has told me several times of seeing people gassing up their cars and noticing their glasses fogging up, thanks to the gaps in the masks.
Instead of normal breath going out and down, the back pressure of the masks just force the exhales up and out. The masks are a joke.
My glasses fog up every time I wear a mask, if I go from the cold outside into a warm building. I try to only shop for food 2 times each week. Thankfully i don’t need to wear a mask at work.
Added fun side to that. Went to a college football game back in November. Had to wear a mask the whole time. By the end of the game, I wasn’t seeing so clearly. Turns out that my clean glasses developed a film from fogging up so often due to the mask.