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

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. Study: Face Shields Not a Good Mask Substitute

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. In laboratory simulations, face shields blocked only 2%