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GidMK's profile
Health Nerd
Health Nerd
Health Nerd
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@GidMK

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Health NerdVerified account

@GidMK

Epidemiologist. Writer (Guardian, Observer etc). "Well known research trouble-maker". PhDing at @UoW Host of @senscipod Email gidmk.healthnerd@gmail.com he/him

Sydney, New South Wales
theguardian.com/profile/gideon…
Joined November 2015

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    1. Health Nerd‏Verified account @GidMK 20 Sep 2020

      A study recently made massive, international news for reportedly showing that normal glasses may protect against COVID-19 Let's do a brief peer-review on twitter, because this is wild 1/npic.twitter.com/T94hRFvfXU

      8 replies 80 retweets 185 likes
      Show this thread
    2. Health Nerd‏Verified account @GidMK 20 Sep 2020

      2/n The study is here. Altmetric of >2,000, hundreds of news articles about it alreadyhttps://jamanetwork.com/journals/jamaophthalmology/fullarticle/2770872 …

      1 reply 2 retweets 14 likes
      Show this thread
    3. Health Nerd‏Verified account @GidMK 20 Sep 2020

      3/n The basic idea of the study is simple - we know that COVID-19 can be spread through droplets. Sometimes these droplets might go into eyes. Wearing glasses might prevent this, so do people who wear regular corrective glasses get COVID-19 less than people who don't?

      1 reply 3 retweets 14 likes
      Show this thread
    4. Health Nerd‏Verified account @GidMK 20 Sep 2020

      4/n Now, usually what you'd do here is identify one group of people with glasses, one without, and follow them up through time to see if the infection rates were different This is what's known as a cohort study

      1 reply 2 retweets 23 likes
      Show this thread
    5. Health Nerd‏Verified account @GidMK 20 Sep 2020

      5/n Another way of doing this research would be to look at people who have caught COVID-19, and another group who haven't, and compare them in terms of the proportion who wear glasses This is called a case-control study, and is what these researchers appear to have donepic.twitter.com/yn6yCxsm1Q

      1 reply 2 retweets 27 likes
      Show this thread
    6. Health Nerd‏Verified account @GidMK 20 Sep 2020

      6/n Essentially, the cases (COVID-19 patients) wore glasses less than controls (non-COVID-19 patients), which might indicate that glasses prevented COVID-19 infection So far so good, right?

      1 reply 2 retweets 13 likes
      Show this thread
    7. Health Nerd‏Verified account @GidMK 20 Sep 2020

      7/n Well, there are a few immediate and obvious snags Snag 1: small sample size. We have <300 cases and no information on controls. That's weird, and problematic (usually these studies are much bigger)pic.twitter.com/XlgaAoXkB8

      1 reply 3 retweets 31 likes
      Show this thread
    8. Health Nerd‏Verified account @GidMK 20 Sep 2020

      8/n Snag 2: The outcome measure isn't wearing glasses. The study actually appears to compare short-sightedness percentages between the cases and controls, which is an obviously imperfect measurepic.twitter.com/16EPba7jxB

      1 reply 2 retweets 24 likes
      Show this thread
      Health Nerd‏Verified account @GidMK 20 Sep 2020

      9/n (It's imperfect because not everyone who wears glasses is myopic and not everyone who is myopic wears glasses >8hrs per day)

      6:25 PM - 20 Sep 2020
      • 2 Retweets
      • 28 Likes
      • ice9 Timothy Huyer Glenda Magallon Marc Schulze (😷 & 💉) 🇨🇦🇩🇪 Kristine Ross kaitybgood Luiz Gonzaga! - BaiãoEterno!_A Capacitância! - NE! Liz "The Mask Goes Over Your Nose AND Mouth" Ditz
      1 reply 2 retweets 28 likes
        1. New conversation
        2. Health Nerd‏Verified account @GidMK 20 Sep 2020

          10/n But then we hit the biggest snag of all The control population You see, the authors didn't actually collect a control sample. The rate of myopia here is from ANOTHER STUDY ENTIRELYpic.twitter.com/YH4f5BlDBK

          1 reply 3 retweets 42 likes
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        3. Health Nerd‏Verified account @GidMK 20 Sep 2020

          11/n Not only that, but the study was conducted IN 1987 and the extrapolation is just weirdly moved forward from then This makes NO SENSE AT ALLpic.twitter.com/2RpQyPbyhY

          2 replies 4 retweets 41 likes
          Show this thread
        4. Health Nerd‏Verified account @GidMK 20 Sep 2020

          12/n I honestly don't know what to say here. They're comparing the rate of myopia in a group of hospitalized patients with COVID-19 to the research findings of physical fitness of students from 1987 You can't draw any meaning from that!

          2 replies 12 retweets 67 likes
          Show this thread
        5. Health Nerd‏Verified account @GidMK 20 Sep 2020

          13/n These two groups are so wildly different that it's entirely impossible to say whether the glasses had the slightest impact on anything at all, it's just very strange speculation

          1 reply 6 retweets 33 likes
          Show this thread
        6. Health Nerd‏Verified account @GidMK 20 Sep 2020

          14/n Maybe glasses DO prevent COVID-19 transmission, but based on this research we have absolutely no idea if that's true

          1 reply 6 retweets 36 likes
          Show this thread
        7. Health Nerd‏Verified account @GidMK 20 Sep 2020

          15/n The ABSOLUTE BEST you can say from this research is that it appears that fewer patients diagnosed with COVID-19 from a single hospital in Hubei had myopia than some high-school students in '87 It's not even about glasses!

          2 replies 11 retweets 100 likes
          Show this thread
        8. End of conversation

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