StrayDog; I've never given it a thought. Brunton, Steiner and Lieca binos no glitches at all in the cold, Leupold, Swarovski, Nightforce scopes no issues in the cold.
Just don't breath on the lenses. I always put a leather flap on my binos to keep the eyepieces covered when not is use to protect them from snow and condensation dripping off my face. The leather is use is soft enough it can also be used to clean the lenses.
