A new study has hit the headlines claiming that eyeglasses can reduce your risk of catching COVID-19 by "2-3 times: Unfortunately the science is...not good Some peer-review on twitter 1/npic.twitter.com/1Enor2djhK
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10/n What this calculation actually gives you is the likelihood of wearing glasses in COVID-19 vs non-COVID-19 people In other words, what we've got here is the relative risk of glasses-wearing behaviour in COVID-19 patients compared to everyone else
11/n So not only is the study a tiny cross-sectional survey with no appropriate comparator, it's also not calculating what the headlines (and conclusions) say it is at all
12/n What the headlines should say is that COVID-19 patients are 2-3 times less likely to wear glasses than the general population, based on a small, biased survey But I doubt that will get as much attention, because it's a bit meaningless
13/n Here is the conclusion of the study. This is not correct based on the methodology as described:pic.twitter.com/SRaHx0zzZ8
14/n Oh and in case anyone was wondering, according to Altmetric the study has been in 51 news articles so farpic.twitter.com/dSFahe908r
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