Kurt Andro – December 13th 2020
Fogged lenses can significantly impair vision. They are annoying and sometimes dangerous. When moving from a cold environment to a heated room or when wearing mouth-nose protection, common tips and methods (applying soap or sprays, tucking a tissue under the edge of the mask, etc.) are often not enough to keep glasses fog-free.
Hence my question to the Maker community, to manufacturers of eyeglasses, lenses, car windows, and to anyone else interested:
Could the method described below work and be practical?
You would need: A pair of glasses with a plastic frame and an electrically conductive core in the temples. In addition, a spectacle strap.
The goggle strap consists of a two-pole cable. Plus comes to one temple, minus to the other.
In jacket or trouser pocket: a rechargeable battery, e.g. USB Power Pack - 5 Volt / 2 Ampere
In the cable: a switch or rotary knob (potentiometer)
In the eyeglass frames: Conductive paths that bring the power supply to the lenses and bridge the nose piece
In, on or at the glasses: Heating elements, e.g. in the form of
- transparent, heatable sheet (as in some car windshields)
- or heating wires (thinner than car rear windows)
- or heating wires, which run around the glass (so outside the field of view)
- or ...?
Since (unlike car windows) no ice needs to be defrosted, but the glasses only need to be warmed slightly, the power supplied by a power pack, about 10 watts in the example, should be sufficient.
By presenting this idea, I hope to stimulate lively discussions and cool prototypes that will ultimately lead to great finished products.
I welcome mail to: firstname.lastname@example.org
The graphic (glasses without the band) is from pixabay.com