halo...no, really unlikely. much more likely for your glasses to be crooked and one lens is CLOSER to your eye than the other one.
if its your left lens that fogs up: take your sunglasses off, hold them up in front of you with the lenses down and the temples (arms) up like a "U". bend the left temple IN a little and/or the right temple out a little.
if its the right lens that fogs up: take your sunglasses off, hold them up in front of you with the lenses down and the temples (arms) up like a "U". bend the right temple IN a little and/or the left temple out a little.
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