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How do I prevent my prescription or safety glasses from fogging while wearing a face covering?

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The warm, moist air in exhaled breath can cause water droplets to condense on glasses lenses, even if the face covering or mask is tight-fitting. Washing lenses with soap and water and drying with a soft cloth can prevent fogging. Prior to donning the face covering, wash hands with soap and water for at least 20 seconds, then gently wash lenses with soap and water, followed by thorough rinsing and drying with a soft cloth. 

There are also many anti-fog sprays available or safety glasses that are pre-treated with an anti-fog coating.