Face Shields and Valved Masks Offer More Comfort but Less Protection

 While any face covering is better than nothing, clear plastic shields and masks with exhale valves allow large plumes of particles to escape and may also expose the wearer to more germs.

Face shields and valved masks — two options many people find more comfortable than cloth face coverings — appear to be less effective at blocking viral particles than regular masks, a new study shows.

The Centers for Disease Control and Prevention had already stated that clear plastic face shields and masks equipped with vents or valves are not recommended, because of concerns that they don’t adequately block viral particles. But the new research, which uses lasers to illuminate the path of coughs, offers a striking visual demonstration of how large plumes of particles can escape from behind a face shield or vented mask.

Face shields and valved masks — two options many people find more comfortable than cloth face coverings — appear to be less effective at blocking viral particles than regular masks, a new study shows.The Centers for Disease Control and Prevention had already stated that clear plastic face shields and masks equipped with vents or valves are not recommended, because of concerns that they don’t adequately block viral particles. But the new research, which uses lasers to illuminate the path of coughs, offers a striking visual demonstration of how large plumes of particles can escape from behind a face shield or vented mask.

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