What is a point of contention regarding the effectiveness of face shields?

The effectiveness of face shields has sparked debate among health experts, particularly concerning their protective capabilities against viruses. Some experts argue that face shields do not provide adequate protection because they may leave gaps where respiratory droplets can enter or escape. Unlike masks, which fit snugly around the mouth and nose, face shields create a barrier that does not cover these areas completely, potentially allowing the transmission of airborne pathogens. This has led to concerns about their ability to prevent illness, particularly in environments with high transmission rates.

Discussions around face shields often include considerations such as comfort, ease of cleaning, and whether they effectively block smaller airborne particles. However, the critical point of contention remains focused on their overall protective efficacy against viral transmission, which supports the assertion that some experts believe they do not offer sufficient protection against the virus.