No-fog sprays for glasses work, but can be harmful

To prevent your glasses from fogging up, you need to make sure your face mask fits snugly at the upper edge and is tucked well under the glasses. — dpa

As anyone who has ever worn glasses and a face mask at the same time will know, fogged-up lenses are a constant problem. Anti-fogging solutions promise help, but consumer experts are warning that some contain harmful substances.

With fogged-up glasses now an everyday nuisance during the pandemic, more and more shops are selling these special sprays with a moisture-repellent effect supposed to prevent moisture fogging up your glasses.