I have always been impressed by the lenses which automatically change from clear to shaded when they are exposed to bright light. It’s a pretty cool technology that allows people who regularly wear glasses to wear sunglasses without carrying a second set of prescription eye-wear.
The other day I was riding around in a car with the air-conditioning running strong. When I stepped out of the car, the temperature difference between the lenses of my sunglasses and the outdoor temperature was enough to cause the lenses to fog up.
The fog did not last long, but it got me to wondering, does anyone make glasses which are not subject to this plight? I suspect it would be nice for anyone who lives in a warm climate and frequently goes from air-conditioned areas out into the heat.