how to avoid fogging on glasses

In order to combat the spread of Covid-19 and a second wave, the wearing of masks could become widespread in France, or even become compulsory in public spaces. A measure that would affect some more than others, like those who wear glasses. The cause: fogging.

Indeed, the mask directs most of the expired air upwards, where it comes into contact with the glasses. “Fogging occurs when the hot water vapor condenses on the coldest surface of the glasses and forms fine drops which scatter light and reduce the ability of the glasses to transmit contrast “, explain the authors of an article on the subject published in 2011 in the medical journal Annals of the Royal College of Surgeons of England. How to avoid this phenomenon?

Wash your glasses with soapy water just before putting on your mask

The text offers an element of response. Just before putting on your mask, it is recommended to wash your glasses with soapy water and then remove the excess before allowing them to air dry or gently wipe the glasses with a tissue.

If this technique has proven successful against fogging, it is because the soapy water leaves behind a thin film which spreads the water molecules evenly on the glasses. As the authors of the article point out, this method is frequently used to prevent fogging on all kinds of surfaces on a daily basis.

Position a handkerchief folded horizontally on the bridge of the nose

However, there are other techniques to avoid fogging, including that of the tissue. It should be folded horizontally and then positioned between the face and the top of the mask. Thus placed on the bridge of the nose, it absorbs the moisture rejected by breathing.

People who wear glasses can also turn to anti-fog sprays or gels. Finally, properly positioning your mask is essential to minimize fogging on your glasses. For example, it is necessary to pinch the small wire which is at the level of the bridge of the nose on the masks which are provided with it.

Good practices essential to the effectiveness of the mask

In general, whether you wear glasses or not, the World Health Organization (WHO) reminds you of the appropriate steps to use your mask correctly. So, you should wash your hands before putting it on. To be effective, it must cover the nose and mouth. “Make sure you fit it best on your face “, recommends the institution. Once the mask is worn, avoid touching it. “Every time you touch a used mask, wash your hands “, says WHO.

Likewise, a single-use mask should not be reused and, as soon as a mask becomes wet, it should be replaced by a new one. To remove it, here too, precautionary measures apply. “Remove it from behind (do not touch the front of the mask); immediately dispose of it in a closed bin; wash your hands with a hydroalcoholic solution or with water and soap “, lists the institution.

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