Should I Wear an Eye Shield to Protect Against COVID-19?

The short answer is, wearing an eye shield is more of a theoretical concern rather than a practical need. While masks are highly recommended, the eye shield is not typically considered a necessary protective measure. Most people who are concerned about COVID-19 can rely on their currently available masks and social distancing practices. However, understanding why may be helpful.

Effective Protection Against COVID-19

The best way to protect against COVID-19, according to current medical advice, is to get vaccinated. This is without a doubt the most effective method.

For those seeking additional layers of protection, a historical yet impractical solution would be a brass or copper deep-sea diving helmet from the 1920s, complete with a canvas and rubber suit. However, in reality, masks and social distancing are the much more practical options.

How Do Masks and Eye Protection Prevent Infection?

The main entry point for COVID-19 is through the nose and mouth, not the eyes. While it is theoretically possible for the virus to enter through the eyes, there is no clear evidence of specific cases where this occurred. However, droplets can enter the eyes very easily if they manage to get under glasses, especially due to their small size.

Glasses will only block droplets that land directly on them. If you touch the glasses and then your face, the risk of spreading the virus remains. Therefore, while glasses might offer some protection from direct spatter, they do not effectively block airborne particles or aerosols.

Can Vapors or Aerosols Enter Through the Eyes?

Airborne or vapor-born viruses can indeed enter through the moisture in the eyes. This is why masks and other PPE are suggested, as they can help prevent these types of viruses from reaching the mucous membranes of the eyes, nose, and mouth.

While glasses can help protect your eyes from a direct spatter, they do not offer significant protection against aerosols. The risk of infection through this pathway is considered fairly low. You need the pathogen to be present, and even then, the successful transfer to a new host is unlikely to be a frequent occurrence.

The Role of Social Distancing and Other Measures

Remaining socially distant plays a crucial role in reducing the risk of infection. Every metre closer than 10 in open air or 20 in an enclosed area increases the risk exponentially. Any form of PPE, including masks, respirators, plastic suits, and goggles, can help, but the eyes have not been singled out as a primary pathway for infection.

It is worth noting that both the common cold and other respiratory illnesses can infect through the eyes, as well. Therefore, wearing an eye shield or glasses is not likely to cause harm, but it is not necessary unless there are specific recommendations from health authorities.

In conclusion, while eye protection like shields or glasses can help, masks are far more important as they form a barrier against air entering the lungs, where the virus can easily become established. Social distancing and proper mask-wearing are the best defenses against COVID-19.

Resources:

Masks and Respirators: A Guide for Public Health - CDC Guidelines Protective Eyewear for Healthcare Workers - OSHA Guidelines Social Distancing Best Practices - WHO Guidelines