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Some prefer face shields to cloth masks. Experts are split on effectiveness. - NBC News

Some prefer face shields to cloth masks. Experts are split on effectiveness. - NBC News

Some prefer face shields to cloth masks. Experts are split on effectiveness. - NBC News
Jul 08, 2020 1 min, 21 secs

The Centers for Disease Control and Prevention says cloth face coverings can help slow the spread of the virus that causes COVID-19, but many people still resist wearing masks.

"People who wear these homemade cloth masks are invariably touching their face constantly to adjust it, and we know that touching your face is one routine mechanism for infecting you," said Dr.

Unlike masks, which help prevent users from spreading COVID-19, face shields also protect those wearing them from infection, Perencevich said.

He referred to a study that said face shields reduce inhalation exposure to influenza virus.

But the author of the study, William Lindsley, a research biomedical engineer at the National Institute for Occupational Safety and Health, said the general public should stick to cloth face coverings.

"A cloth mask or a medical mask is going to do a better job of protecting you against the smaller particles than a face shield would," Lindsley said.

Even so, Perencevich said the study is reason to advocate for face masks.

"Masks are source control protecting others, whereas face shields are both source control and protecting yourself from the droplets landing anywhere on your face," he said in an interview.

Doctors, nurses and other health care workers in close contact with patients use face shields, along with N95 masks, to prevent virus droplets from getting into their eyes.

"All the types of face coverings are just one flawed prevention approach that shouldn't, you know, be a replacement for or lessen the importance of physical distancing, and perhaps most importantly, eliminating the close congregate indoor settings where we're seeing large numbers of infections take place," he said

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