frame heater

frame heater

A device used to warm plastic spectacle frames in order to soften its material sufficiently to allow insertion of lenses and/or adjustment. Some frame heaters warm air, which is directed to the area of the frame that is to be altered. Others heat salt or glass beads to a given temperature and the part of the frame that is to be altered is placed into the heated material. Syn. frame warmer. See plastic spectacle frame.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
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I'm sure I'm not alone in being defeated, after an age spent at the frame heater, by the impossible task of attempting to reduce the length to bend of a thick side.
That's why in many commercial freezer installations, the doors and frames are heated by internal frame heaters that operate 24/7 to prevent excessive condensation buildup.