Official medical associations are not recommending blue light glasses (as of November 2020).
This doesn’t mean they don’t work, but there’s a lack of clinical evidence supporting their purported use cases.
Doctors *are* promoting the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds.
A few years ago, eyeglasses stores started asking if I wanted blue light filtering lenses in my glasses. They said something about reducing eye strain. I didn’t really know what they were good for, but they weren’t expensive, so I said yes. Subsequently I began spotting them on a lot of my friends. They’re particularly noticeable now, because we’re all hanging out on video chat, and these filtering glasses have a telltale reflection - something like this:
Blue light filtering glasses are advertised by trade groups as lowering eye strain, improving sleep, and protecting against eye diseases like Macular Degeneration. Medical associations are a bit more bearish, though: I found an instance [1, and expanded in 2] where academics did reviews of published research on blue light-blocking glasses.
After filtering down to credible*, random-controlled studies, they found that there was basically no strong evidence to support blue-blocking glasses for any of the purported use cases: visual performance, sleep quality, fatigue, or prevention against macular degeneration. Some of the arguments for blue-blocking are based on extrapolations from lab studies, but not enough has been done in terms of clinical studies to make any sort of recommendation.
What medical professionals are recommending, though, is the 20-20-20 rule. The idea is that most of your computer strain just comes from staring at a screen for too long. The suggestion then, is that every 20 minutes, you look away from your screen and at something 20 feet away, for 20 seconds.
*As an example of less-credible research - here’s some recent research that claimed slightly longer sleep (5-6%) in people who wore blue-blocking glasses, named the brand of glasses, and included a purchase link to those glasses in their explanatory blogpost. That…does not seem impartial.
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Some References for more reading:
https://www.webmd.com/eye-health/news/20191216/do-blue-light-glasses-work
https://health.clevelandclinic.org/do-blue-light-blocking-glasses-actually-work/
https://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side
https://onlinelibrary.wiley.com/doi/full/10.1111/opo.12414
https://my.clevelandclinic.org/health/diseases/21059-eye-strain