The idea about the face mask is to prevent the virus from coming out of somebody's mouth and nose, mostly out of their mouth, they prevent somebody, when they talk or sometimes when they sneeze or cough, from expelling virus and leading to infection in other people.

Joseph Vinetz

It's part of our social contract to look after one another, it's social solidarity for everybody in a public place, when told to by public health and political authorities, [ to ] wear a face covering according to what's recommended.

To avoid fogging up your glasses -- I have the problem Joseph Vinetz -- short of getting Lasik surgery, you have to fold the mask around your nose so that the air coming out of your mouth or nose doesn't rise to your glasses.