Study: Face Shields Not A Good Mask Substitute Apr 2026

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

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

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. In laboratory simulations, face shields blocked only 2%

While shields block the initial forward "jet" of a cough or sneeze, smaller aerosolized droplets can easily flow around the sides and bottom of the visor. If a wearer inhales as these particles arrive,

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.

Research on the efficacy of face shields confirms that while they are excellent for blocking large splashes, they are in preventing the spread of airborne pathogens like COVID-19.