Sunglasses / Fog

[marni]

I second the use of cat crap for glasses, inside of car windows ( a little goes a long way), bathroom mirrors, scuba masks etc.

[out_spokin']

+ 3 on the little red container...

But if it's super cold, there's nothing that really keeps the fog off my regular Smith sunglasses, so when I commute below 15F or so I use ski goggles, which looks crazy but works phenomenally.

[loopybunny]

Is that stuff safe for prescription lenses? I have prescription Transitions lenses in my Oakleys and I don't want to risk ruining them or voiding the "warranty" on them. They're the only Rx sunglasses I have since I dropped my Spy and scratched the new lenses in those.