The key issue in a patent is not the figure or description, which are just examples, but the claims.
If you look at the claims on this patent, they (to my non-attorney eyes) seem pretty reasonable for what they claim -- which is NOT heated lenses, but a heated frame.
There is an old joke here told about the "stylish" dudes who always wear their sunglasses pushed up on their foreheads. When asked about , ah, certain body part temperature differentials, they point up and say "it's the solar collectors on the roof". Maybe you could convert the light blocked by sunglasses into electricity to charge your phone...there, now that idea is public domain and can't be patented.
The very first thing that I noticed was that the power source is so small as to be unable to provide a useful amount of heat. After that, the only needed control is an on/off switch, with the design size of heater setting the maximum heating level. So now the amplifier and thermal controlling system can be eliminated and the whole thing gets quite a bit simpler. But that still leaves the power source as a large problem.
Uhhhh! Has no one bothered to estimate how much energy and at what rate it might be needed and compare it with a cell/battery that might actually fit within the confines of a practical glasses frame? I guess if you have a power amplifier, you don't need much of a battery. [;-D
It is a very interesting patent application. I'm not sure whether there is any safety concern given the heated elements so close to the eyes.
Just a bit side track, in cold weather, feet, hands, nose and ears will be cold first. A helm to generate heat to surround your head might keep you warm. A simple beanie will certainly come handy. In extreme weather, professional climbers wear mask. ;)
Well, just yesterday I had to "rescue" my five-year old daughter who had fallen face down in the snow and had her glasses totally covered in snow. Given the price of kids speciality glasses I'd happily fork up an additional $50-100 USD for this feature.
Anyone who tries to ski (or clear a snowy driveway) while wearing glasses and a ski mask quickly discovers the problem of fogging glasses. A working glasses heater would indeed be very helpful. If the patent has errors, that is no big deal; it is easy enough for a manufacturer to correctly connect the power wires.