h a l f b a k e r yI think this would be a great thing to not do.
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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.
Heated Goggles
https://airandspace...y-heated-gogglesjpg
[bs0u0155, Nov 04 2020]
[link]
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Also useful for Transitions type lenses which take considerably longer to return to clear in cold weather. |
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I don't think heat would propagate very quicky from the
frames across the lenses. |
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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. |
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Batteries wouldn't last long, though. |
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Photovoltaic power ? After all, if it's dark, you don't need glasses ... |
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But how could you possibly use sunlight to warm something
up??? |
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A hand crank in your pocket? |
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No, onlookers might misunderstand .... |
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Peltier plate TEG worn around the neck then? |
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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. |
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Humans have a dedicated high-capacity blood supply to the ears, because proto-humans used them to cool the brain (if any). |
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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. |
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Bah. Once again, a good idea to stop spectacles fogging when wearing a facemask turns out to already exist on the hb ... |
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//spectacles fogging when wearing a facemask// I have
a wire running along the top edge of my facemask
which can be moulded to closely follow the contours
of my nose - doing this stops my glasses fogging up. |
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It is not a problem affecting us, but others seem to suffer from it, and it occurred to us that there is money to be made from a suitable innovation, along with the special-to-type disposable batteries... |
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hmm, heated optics are very old. The window on a ~1960's
vintage cold room in my building has a heated window.
Pilots <link> were using them in the black and white days
and I know a Canadian that says that heated snowmobile
goggles were a thing in the 1970s* |
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*Canada is expected to enter the 1980's within the next
century. |
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