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DID YOU KNOW ?
It's very important to know universal rules about glasses eye protection's properties, whatever treatment about anti fog ( anti fog product - fan - thermal screen et etc ) and whatever hobbies.
The physical and wheather conditions on someone could be important to sweat and fogging up on your glasses eye protection.
" Sweat = Fog "
Universal rules about glasses :
Universal rules about physical conditions about people, weather conditions and consequences on Glass/Miror/lens/screen :
Another natural and meteorological phenomenon :
Your head port setting can be critical :