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Mask + Goggles = FOG! How do I prevent my glasses from fogging up?

Wearing a mask is now compulsory in many countries including France. Whether in public transport, in public places, in high schools, the mask has quickly become an essential part of our daily lives.

Why is my prescription glasses or sunglasses fogging up?

When wearing glasses and a mask or mask-visor several hours everyone can realize the fogging of the glasses .