Face Shields are NOT more effective than face masks. Rather, face shields may offer lesser protection than face masks.
The US Centre for Disease Control and Prevention (CDC) does not currently recommend use of face shields as a substitute for masks while the current HSE guidance states, “If you find it difficult to wear a cloth face covering, it’s okay to wear a full face visor or face shield instead. They are not as good as wearing a face covering, but you’ll still get some level of protection.”
A 2014 study found that a face shield alone might not be sufficient to protect the wearer from aerosol droplets.
Face shields should only be worn in conditions where wearing a face mask is not possible. The HSE website mentions, “Visors are not the best option for protecting yourself and others from COVID-19. They should only be worn if you have an illness or impairment that makes wearing a face covering difficult.”
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