This paper discusses UV-curable super-hydrophilic anti-fog coatings.
At certain temperature and humidity, water vapor in air condenses on solid surfaces. Because water has much higher surface energy than most solid surfaces, the condensed water usually takes the form of small droplets, which scatter light and cause haziness. Fogging is a severe problem for a lot of optical devices, such as lenses, mirrors, windshields and visors et al. Basically, there are two ways to avoid hazy water condensation. One is to control the temperature and humidity so that water condensation can not happen.