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If eyeglasses could be made out of a meterial with a suitably low thermal mass, they would be unable to absorb enough heat to cause water from the air to condense; as a result, they wouldn't fog up.
The only material that comes to mind, though, is a very thin film with a holographic lens on it.
holographics to create a lens is baked (or at least patented), but as far as I know, noone's previously suggested that it as a means to prevent fogging.
How to make a holographic concave lens
[goldbb, May 03 2009]
||Perhaps another material would be carbon. Your thermal mass is my specific heat capacity. In this case good old diamond lenses are what you are after. Now that we can build our own diamond crystals with plasma lamination, I guess we are not too far from this idea. Of course, you may have to get rid of that pesky De Beers whatsits.
||Another thing to use would be the wonderful quasi-crystals (google that) we can now create given our understanding of 3d penrose tiling. Sure that one is a long way off, but no expense spared in the "steam on my glasses" realm.
||Now we need ultrasonic de-inker for our pocket protecters.