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Study: Face Shields Not A Good Mask Substitute Link

The Centers for Disease Control and Prevention (CDC) and other health authorities do not recommend face shields as a primary substitute for cloth face coverings because they lack a peripheral seal.

Studies published in journals like Physics of Fluids highlight several critical reasons why face shields fail as standalone protection: Study: Face Shields Not a Good Mask Substitute

In laboratory simulations, face shields blocked only 2% of exhaled cough aerosols, whereas N95 respirators blocked 99% and medical masks blocked 59%. Comparison: Face Shields vs. Masks The Centers for Disease Control and Prevention (CDC)

Simulations show that high-velocity vortex rings produced by a sneeze can reach the top and bottom edges of a shield in just one second. If a wearer inhales as these particles arrive, they can draw infectious air directly behind the shield. Study: Face Shields Not a Good Mask Substitute

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