I DON'T GET IT.

I don't understand the efficacy of these full face shields. If your speaking, sneezing, or coughing lingers in the air like a mist and the person you're speaking to has a face shield doesn't the mist easily
move up the open area behind the shield? I would say a face shield is of no value unless you're also
wearing a mask and, if so, why would you need a shield. The TV ad for the shield suggest you can wear your glasses with the shield, even your sunglasses—duh.