The face-shield has a lot going for it.
Other personal protective measures are still better,
including frequent hand washing with soap, minimizing touching of the face, disinfecting
surfaces, isolation, maintaining physical distancing and using barrier protection where
it is hard to maintain safe distances from others. But if you have to go out where
physical distancing is difficult or not possible, the face-shield is a solid option.
It doesn't trap the virus tightly against the face. It's hard to
wear improperly. It prevents people from touching their face. It is reusable, easy to
clean / disinfect, and affordable when you consider the number of times you can reuse it,
compared to say the cost of using a couple of hundred disposable masks, or even having
three or more cloth masks. It prevents transmission of
the virus in the forward direction due to coughing, sneezing, breathing and speaking.
The face-shield has one significant disadvantage: deflection.
When you cough, sneeze, speak or breath out, the air flow - which may contain the virus
if the wearer is contagious - hits the inside of the solid face-shield, and then deflects
away downward, to the sides and rear. (Most face-shields have a visor to prevent air
To understand the deflection issue, I recommend reading this scientific paper (pre-print).
I found the images to be particularly helpful.
Resolving the deflection issue makes a better solution for personal protection and
reducing outward virus transmission.
All material related to the curtain design for face-shields is copyrighted by Darryl McMahon.
This includes, but is not limited to the designs, patterns and instructions for the curtain construction
and the terms: 'Curtains for COVID'; 'Curtains4COVID'; 'COVID Curtain'; 'face-shield curtain';
and 'face-shield wraparound'.
All rights reserved.
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