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I've already had to deal with warranty issue with oakley, and if the outside lens is not crack, it won't be warrantied. You could still try.
Is it really in the middle, from top to bottom? If you dont see it when skiing, you could try to use some superglue/ precicion glue (dont know how you call that in the US) people use it to glue things like small model planes and stuff.. so glue with a needle on it.. if you can seal it it wont fog anymore..
It will fog, because condensation would be trapped in there.. Except if he can vaccum out the condensation.