You guessed it: We are talking about people who wear glasses. When these poor individuals enter a warm room from the cold, their lenses steam up – from one moment to the next they can’t see a thing! This funny - or not so funny - physical effect occurs when the warm air cools down on the cold lenses and they can no longer hold as much moisture. The water condenses on the lenses and the annoyed wearer has a blurred vision. Even the pitiful looks of people with eagle eyes do not help.
"This is a niche subject," you say? Please, not so fast. There are more and more people who wear glasses: In Germany, for example, two out of three adults depend on some kind of visual aid. Around 20 years ago, just under a quarter of people worldwide were spectacle wearers, now that figure has almost doubled. Four billion people! Quite a lot! Declining eyesight is also increasingly affecting children and teenagers. The reason: excessive smartphone use. In general, the number of people who wear glasses increases with age. This topic, dear readers, probably affects almost all of us. People who don’t wear glasses can certainly sympathize, especially if they pursue a hobby such as diving, skiing or motorcycling.
Water sports enthusiasts like to resort to a trick: they spit on the inside of their diving goggles to avoid fogging. We all agree that this is not an option for everyday life. Imagine in corona times hordes of people spitting on their glasses: a nightmare! The virus is the reason why fogged lenses are such a big issue right now. Masks are mandatory, for your own protection and for the protection of your fellow men. Unfortunately, with masks the effect of fogged lenses occurs much more often. The warm breathing air escapes upwards from the mask and condenses on the lenses. Probably the easiest way to prevent this is to first put on the mask and then wear the glasses over it. You could also make sure your masks fits as tightly as possible - generally a really good idea! By the way, masks with a sewn-in metal temple on the upper edge are particularly suitable. With a fabric mask, which can be folded inwards at the upper edge, you can also alleviate the effect.
Anti-fogging coatings and sprays can also help. The coatings are applied directly to the glass during production. Nanotechnology makes the surface hydrophilic, i.e. water-attracting, and the droplets subsequently melt into a transparent film. This is not cheap and the coating must be applied during the initial production process. At least temporarily, anti-fog sprays or anti-fog cleaning cloths can also help. A kind of "life hack" is this miracle cure: shaving foam. Simply apply on both sides and rinse carefully with warm water! Please do not use shaving oil, unless you want to lose sight of everything. One more tip: Try contact lenses (if you can tolerate it).
No matter which method you use to de-fog, we wish you good luck! This winter, don’t lose sight of what is important! And, most importantly: Stay healthy and safe!