I had a pair of glasses that did not fog. The lenses were coated with a hydrophilic coating, which absorbed the tiny droplets of water that make up fog. Once it

I had a pair of glasses that did not fog. The lenses were coated with a hydrophilic coating, which absorbed the tiny droplets of water that make up fog. Once it was saturated, water could form large droplets but not fog. This is basically how licking your lenses or spitting on them works, or stuff like Cat Crap. The difference here is that the coating was baked on; it could not be rinsed off. The downside was that the coating was very soft when wet and easy to damage. So it’s not really commercially viable. I bought a pair directly from the inventor, with trust between us that long-term performance was up to my discipline in protecting the lens coating. They also had to be hand-washed regularly as contaminants in the river water would impair the anti-fog coating as well. They worked great until I left them on top of my car and drove home one day…