Method 1: eyeglasses pressure mask method

   The easiest way is to press the eyeglasses on the top of the mask while wearing the eyeglasses. We can lift the mask up to roughly below the eyes, and then adjust the wire on the mask to make it fit tightly on the bridge of the nose. The heat exhaled in this way is not easy to escape. Finally, press the eyeglasses on the mask, so that the small amount of heat that escapes will not easily hit the lenses and condense, and the eyeglasses will not be prone to fogging.

　But this method has a small flaw, that is, it will enlarge the distance between the eyeglasses and the eyeball, which changes the correct distance between the eyeglasses and can not achieve the best correction effect, so it is not suitable for long-term use.

Method 2: Apply the lens with detergent, shower gel, etc.

　 Applying hydrophilic surfactant to the surface of the lens is also one of the ways to prevent the lens from fogging.We can dissolve detergent, shower gel and other surfactant-containing products in water, then soak the lenses in it, and then wipe off the water with eyeglasses cloth or paper towels.As long as you don’t touch the water, your eyeglasses won’t fog up all day.

This is because the effective active ingredients in the detergent-anionic surfactants are hydrophilic. When they form a film on the surface of the lens, this hydrophilic and lipophilic molecule can pull the mist on the surface of the lens. Form a water film, different from water droplets, a uniform water film can greatly reduce the diffuse scattering of light, thereby maintaining the high transparency of the lens.

Although this method is effective in practice, it is also easy to damage the lens, so it is not recommended to use it frequently.

Method 3: Use anti-fog eyeglasses cloth & anti-fog spray

Generally, the eyeglasses do not have anti-fog function. At this time, it is not convenient to re-match a pair of anti-fog eyeglasses. Then you might as well try anti-fog eyeglasses cloth and anti-fog spray.

Anti-fog eyeglasses cloth:The anti-fog principle lies in the nano anti-fog factor on the eyeglasses cloth, which can form a protective film on the lens to prevent water vapor from condensing on the mirror surface and achieve the anti-fog effect.

Eyeglasses anti-fog spray:has the functions of cleaning, decontamination, anti-frost, anti-fog, etc., spray it on the lens and wipe it, and it can generally keep it for about 3 days without fogging.The same principle, anti-fog eyeglasses cloth and anti-fog spray can also be used to prevent the rearview mirror or windshield of a car from fogging.