In the past two years, the mask has been worn more, and the probability of glasses fogging up is greater. When others look at me with an unsettled look, I know he must be smiling — the whole lens has turned white, leaving only a little gap in the middle, which is really ridiculous.
The winter of the glasses wearer is often accompanied by countless such moments of social death. Of course, as a veteran glasses person (inexplicably a little proud of it), I have my own way to help myself survive the winter safely.
Method 1. Anti-fog lenses
Today's spectacle lenses can have many functions, such as anti-blue light, anti-scratch and so on. In fact, a film is coated on the lens, and different films can provide different functions.
Now there is a kind of membrane, called "anti-fog film". The lenses coated with this film will be less likely to fog up - in fact, the surface of the lens is made harder and smoother, so that the water mist is not easy to gather together.
Anti-fog lenses are expensive, and I gritted my teeth last year with one. Unfortunately, the effect is really unsatisfactory. It is simply not as immediate as advertised, at most it is slightly better than ordinary glasses. Small fog can prevent, but heavy fog will not help at all.
Method 2. Various cleaners
Detergent, toothpaste, washing powder, shower gel, etc., these common household cleaners contain an ingredient called "surfactant". Do these things feel slippery when you get them on your hands? Part of the reason is that surfactants are at work.
Applying surfactant to glasses will make the surface of the glasses very smooth. To what extent is it smooth: water mist, in fact, is a lot of small water droplets. With surfactants, these small water droplets cannot attach to the surface of the glasses and will flow down on their own under the influence of gravity.
In this way, the glasses do not have the trouble of fogging. The disadvantage is that surfactants volatilize relatively quickly and basically need to be applied together every day.
When using, first wipe the glasses clean, then pour the detergent on the surface of the glasses and apply well with a dry spectacle cloth. Wear glasses directly after applying well, and do not clean them with water again.
Method 3. Wipes
Similar to detergents, wipes also have surfactant ingredients inside. So if I'm outside and my glasses suddenly fog up, I'll be the first to choose to wipe them off with wipes – not everywhere you can find detergent, but it's possible to carry a pack of wipes with you.
The disadvantage of wet wipes is that the effective time is very short, probably because wiping alone cannot allow too much surfactant to adhere to the lens. But as a temporary emergency product, it is enough.
When choosing wipes, try to choose ones with strong cleaning ability, and it is best to choose the kind that can be kneaded in the hand to make a foam. Don't choose any wet toilet paper, oral and hand wipes, private wipes, etc. These wipes reduce the amount of surfactant and do not meet our requirements.
Method 4. Anti-fogging agent
At present, the most effective, durable and economical solution is a special glasses anti-fogging agent. The main ingredients in it are polymers and surfactants.
Surfactants, needless to say, have been said many times before. Detergents and wipes are anti-fogging, also because of surfactants. However, their anti-fog time is too short, because the surfactant cannot adhere to the lens for a long time.
So the anti-fogging agent also adds polymers to the ingredients, which you can understand as an anti-fogging agent can form a film on the surface of the lens. This layer of film can lock the surfactant. In this way, the glasses can be protected from fog for a long time.
I've tried many brands of glasses anti-fogging agents and found that the difference is mainly in the anti-fog time. Some can last for two or three days, and some can only last for a few hours. It's all the same easy to use: some are applied to the lenses with a spectacle cloth for the first drop; some have their own sponge head and apply it directly to the glasses.
The product is more recommended for professional sports products, that is, what ski goggles anti-fog agent, swimming goggles anti-fog agent and so on. The anti-fog effect of these products has been professionally tested, and the effective time is much longer than that of ordinary sanwu products.