Actually, the problem doesn't occur with my heavy duty totally sealed but vented goggles - the ones I wear when danger of eye damage is high, like grinding metal - thee fogging problem occurs only with the combo of safety glasses and a high quality dust mask - even though it has a one way valve that makes inhaling very easy, on exhales water vapor streams out of the nose clip area and fogs the glasses. No solution for that except for pinching the metal clip so tight it hurts! When I doing detailed work that requires a delicate touch the goggles just don't provide enough clear vision to see what I'm doing - perhaps I should look for a scuba mask with a real glass (or lexan) lense, lOL.
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