Which is better for COVID-19 protection : face masks or face shields.

Various type of masks are used by public for protection against COVID-19.

Some wear cloth masks. Some use medical disposable masks. Some wear face shields particularly those working in shops.

Are they all the same?.

No

Recent evidence indicates that standard light-blue disposable surgical masks are the most effective at containing the Cornovirus.

Face shields were found to be failing when compared with standard ( triple layer) medical grade masks.

References

1. Face shields ineffective at trapping aerosols, says Japanese supercomputer. Guardian Newspaper. Justin McCurry in Tokyo. Tue 22 Sep 2020 07.19 BST. https://www.theguardian.com/world/2020/sep/22/face-shields-ineffective-trapping-aerosols-japanese-supercomputer-coronavirus

2. Do cloth masks work? Supercomputer Fugaku says yes.World’s fastest computer calculates that nonwoven fabric is best. YUKI MISUMI, Nikkei staff writer. August 25, 2020 00:34 JST. https://asia.nikkei.com/Business/Technology/Do-cloth-masks-work-Supercomputer-Fugaku-says-yes

3. Visualizing droplet dispersal for face shields and masks with exhalation valves. Physics of Fluids 32, 091701 (2020); https://doi.org/10.1063/5.0022968

4. Visualizing the effectiveness of face masks in obstructing respiratory jets. Siddhartha Verma, Manhar Dhanak, and John Frankenfield. https://aip.scitation.org/doi/10.1063/5.0022968
Phys Fluids (1994). 2020.

Disclaimer: Please note- This blog is NOT medical advice. This blog is purely for information only and do check the the sources where cited. Please consult your own doctor to discuss concerns and options relevant to you.

The views expressed in this blog represent the author’s views held at the time of drafting the blog and is likely to change overtime, particularly when new evidence comes to light. The blog is not necessarily endorsed by any organisation the author is associated with and views are not substitute for professional advice.