Face shields as well. There was an Indian study showing that they reduced infections to nothing in social workers visiting unmasked people. Note that this also means that surgical masks should still prevent infecting others.
There was a Swedish study showing face shields WITHOUT mask don't do anything. Also a study showing people with eyeglasses get infected less, i.e. it's possible that one can get infected thru eyes, although, I thing, it's pretty rare. Let's not forget that tear ducts drain in your nose!
Do you mean face shield only? That seems like it would be much worse than mask only, if covid is airborne as the article suggests. Mask plus face shield should be even better than mask only.
No, they were using face shields as well as mask.
Citation for the study? The Indians also used ivermectin to great effect to reduce their wave 2 months ago.