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FOGGING: A BRIEF!

Fogging | Brief | 07th November 2021 | Virtual Wire

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What is fog? Every human must have administered FOG in their lifetime. A bit formal definition goes like this: Fog is a dark, misty, or hazy layer that can form part of the atmosphere.

Fog shows up when water vapour, or water in its gaseous form, condenses. During condensation, the molecules of water vapours combine to make tiny liquid water droplets that hang in the air. You can see fog because of these water droplets. Water vapour, a gas, is invisible. The fog rises when it's very, very humid. There has to be a lot of water vapour in the air for the fog to form. Why is there any need for anti-fog lenses and coatings? The discovery of "anti-fog lens and coatings" is one of the best achievements of NASA invented because of the fog experience during the first suit space-walk tests. There are many types of anti-fog chemicals, coating, and technology.


Unlike fogging being omnipotent during winters and rainy season but certain professions deal with lens fogging daily such as restaurant workers who lift boiling pot lids or butchers who walk in and out of freezers. Those who wear safety goggles, helmets, or protective masks are also bothered when fog builds up from the steam of their breath, obstructing a much-needed view of their surroundings. Therefore, to ensure a safe commutation and undertaking of daily tasks, it is necessary to have something which helps to solve this issue at hand.


So, the next question that prompts up is: How the problem of "fogging" is solved? By adding a hydrophilic surface layer, water and mist are made to repel from the surface of the lens. This treatment can be applied to all lenses, tinted or not, and for all visual corrections. With this, we don't have to lower the windows of the car during winters, clean the lens of specs while riding bikes, as anti-fog lens and coatings will not allow fog to appear on the lens, glasses in the first place. There exists a wide range of such products with Essilor’s Optifog Technology, Zero Fog, ICOAT No Fog, Fogbuster, Defog It, etc.

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The anti-fog coating can be applied on goggles, dive masks, car windows, visors, kitchen backsplash, also bathroom back-painted glasses, hard surfaces, and other surfaces. Most anti-fog coating materials are temporary or at least wear off after some time. A new permanent anti-fog coating has been developed due to the work in R&D, but still, the traditional ones are in use. With the existence of anti-fog lenses and coating, the problem of anti-fogging is resolved to a large extent as fogging not only hinders the vision but direct exposure can cause a person to even lose his/her eyesight. Even though the benefits of anti-fog lens and coatings, it should be kept in mind that they do hinder the eyesight by making it less clear and even worse. Therefore, everything has a devil and angel at work, it's our responsibility to establish a link between these two.

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