Originally Posted by RShea
Next issue is the glasses do not fog as much if they adjust to the temperature (leave the goggles off for a few minutes when coming out of the lodge, make sure there is not moisture inside the goggle lenses etc.) will help reduce the fogging of the glasses.
This is the opposite of my experience. I feel that glasses fog up when warm moisture-laden air (breath, sweat/vapor from face with heavy exertion, etc.) condenses on cold surface (glasses). If the glasses are warmer than the air hitting them, they do not fog. The Turbo fan works by evacuating the moisture laden air from the goggle chamber and replacing it with cold DRY air. Dry air, so no moisture to condense. But, if you have no fan, then your best bet is to keep the glasses as warm as possible to reduce the chance of condensation. Put them on IN THE LODGE and do not remove them until you are back in the lodge and the internal temp has acclimated to the ambient lodge temp. If you remove too soon in the lodge--instant fog. If you remove them on the lift, your lenses will be clear (and cold). Once you put the goggles back on, you will fog if you start sweating, huffing etc. before the glass has a chance to warm up. If you leave the goggles on while riding chairs etc, you may get a little fog, but if the goggle is well ventilated, this will quickly dissipate as soon as you start moving and the warm moist air is evacuated. Yes, if at some point, you fog badly then you do have to remove the goggles. That is a good time to wipe you glasses with an "anti fog cloth" (while moist--available from Smith etc.), replace goggles and go easy for a few minutes until the temp inside the goggle chamber warms the glass a bit. It is a balance between temperature and humidity. Raising the surface temperature of the glass (leaving goggles on) or reducing humidity (turbo fan evacuating humid air, or avoiding entry of moisture into the goggle chmber) will both decrease the tendency to fog.
Sorry for the long-winded reply.
I hope this helps.