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Heated Glasses

Electrically heated eyeglass frames.
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Make the frames of glasses out of a heating element. Apply a small amount of voltage from one AAA battery worn around the neck (and feeding power through a small wire), to heat the frames and prevent the glasses from fogging every time you walk into a warm building.
DIYMatt, Jan 31 2011

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       Also useful for Transitions type lenses which take considerably longer to return to clear in cold weather.
MechE, Jan 31 2011
  

       I don't think heat would propagate very quicky from the frames across the lenses.   

       However, heated car windscreens have very fine heating elements embedded in them, which are almost invisible (and would be especially so when that close to the eye). Alternatively, transparent oxide coatings can act as conductive heating elements.   

       Batteries wouldn't last long, though.
MaxwellBuchanan, Jan 31 2011
  

       Photovoltaic power ? After all, if it's dark, you don't need glasses ...
8th of 7, Jan 31 2011
  

       But how could you possibly use sunlight to warm something up???
MaxwellBuchanan, Jan 31 2011
  

       A hand crank in your pocket?
pocmloc, Jan 31 2011
  

       No, onlookers might misunderstand ....
8th of 7, Jan 31 2011
  

       Peltier plate TEG worn around the neck then?
DIYMatt, Jan 31 2011
  

       Tear-ducts are not needed 24/7. Simply learn to blow air through them (some people can already do this), and you will be able to warm your lenses without additional apparatus.
MaxwellBuchanan, Jan 31 2011
  

       Humans have a dedicated high-capacity blood supply to the ears, because proto-humans used them to cool the brain (if any).   

       Since the sidepieces of the spectacles rest on the ears, it would seem obvious to make them into heat-pipes, and install a small dispenser for a suitable heat-rub cream to stimulate blood flow.
8th of 7, Jan 31 2011
  
      
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