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The key points are:
- Face visors project airflows downwards away from the face.
- Face visors protect eyes and mouth.
- No moisture build up with extended use.
A new study has been published to further our understanding of how various forms of PPE, worn over the face, can limit aerosol dispersion, and therefore limit virus transmission in the workplace.
Face coverings are becoming a familiar sight in our day to day routines as the restrictions on movement and industry are being relaxed. There is a huge degree in variation in what measures people are adopting, from scarves around the face at the supermarket, to the more considered, multi-layered approach now commonplace in medical settings. What is certain, is that these measures are going to be increasingly necessary over time. It is known that covid-19 and other viruses are transmitted primarily through fluid laden particles from infected people, through coughs or sneezes for example, which can be inhaled, deposited inside the mouth/nose/eyes of the recipient, or deposited on a surface and later transmitted through physical contact.
Image: University of Edinburgh - a thermal plume generated by a human cough, depicting movement of air, and therefore indicating where fluid may be dispersed
It is a clear a barrier can be of some benefit in minimising potentially virus-laden airflow from individuals, but we need to be aware of how we can implement safest practice, and what equipment may be best suited.
A newly published study from the University of Edinburgh examined variations of face coverings, and their effectiveness in lowering possible transmission of a virus ejected from the mouth. They compared surgical masks, homemade fabric masks and face visors amongst others. Along with the various PPE equipment, different expiration techniques were tested (quiet or heavy breathing and coughing).
Image: University of Edinburgh - airflow dispersion as the individual breathes heavily through a surgical mask
Image: University of Edinburgh - airflow dispersion as the individual coughs, whilst wearing a lightweight face shield
Of particular note, is that the data concludes that there is no discernible air movement forwards when the face shield is being worn during quiet or heavy breathing, and coughing. This is reassuring result for many as society is reopening.
At CCL ensuring the safety of others, whilst facilitating the return of many businesses, informed the design of the Face Visor CCL230. Its transparency ensures ease of communication and visibility, whilst also making sure the wearer can easily breathe and protect yourself and others.
Viola, I. M., Peterson, B., Pisetta, G., Pavar, G., Akhtar, H., Menoloascina, F., … Mehendale, F. V. (2020). Face Coverings , Aerosol Dispersion and Mitigation of Virus Transmission Risk. Medical Physics.
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