Anti-Fog specs

A tree came down in my yard after a short but heavy storm. It came down right on top of my electric scooter (no damage!), and also covered the sidewalk.

It was still very wet out, the rain was not quite over yet, and the day had been warm. The chainsaw purred at a quiet idle as I moved around the tree, removing limbs and cutting stove lengths from the trunk to clear the sidewalk.

After a few short minutes I had to remove my glasses, as the combination of work, heat and humidity had fogged them to an opacity usually reserved for frozen beer mugs. No amount of wiping would keep them clear. I couldn't put my contacts in because I don't have contacts, and wouldn't wear them while operating a chainsaw in any case.

I took my glasses off, and set them in a safe place while I continued to work with the chainsaw. My eyesight is bad enough that this is possibly the dumbest thing I have done all year. Be that as it may, operating the chainsaw while still wearing the glasses in their current state would have been dumber still.

My proposal is this: a loop of nichrome heating element wire incorporated into the frames of my glasses could provide enough heat to prevent - or at least reduce - condensation on the lenses. It doesn't take a lot of heat to do this, same as it doesn't take a lot of air movement to prevent condensation. The ideal combination would be to provide a warm airflow, but that requires additional gear; this requires only the glasses - which I already wear, and the heating elements would add virtually no weight - and a cord and battery that could be kept in a pocket or on my belt, and attached only when needed. I already spend much of my day with a personal stereo, Leatherman and flashlight on my belt, so I know the cord and weight are not onerous.