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We've been living a lie...
(Not to be that guy, the post just got me curious about it, so i looked up some more details) (Also, i rant a bit, so feel free to not read this)
Although in the article i checked, the American Academy of Opthalmology (AAO) doesn't specifically mention Dark Mode as something that reduces or increases eye strain, it does mention that lowering the brightness (or setting dark mode in your devices) does lower the amount of blue light that the screen displays, allowing you to sleep better, by not confusing your brain into thinking that it's still daytime. (Feel free to correct me on this, other places i saw about this mostly cite anecdotes about how well it worked for them, regarding their sleep cycle.)
It does later say that one of the ways to possibly reduce eye strain when using a screen for a long time is by lowering the glare and brightness, by dimming the screen or the like.
So my take would be that maybe a full pitch black/AMOLED theme could start putting more strain into your eyes, the regular dark grey-ish should be right, but eyes differ from person to person so it'd boil down to: Find a middle ground that works for you and doesn't make your eyes hurt? (Also take some time to let your eyes rest, lookup the 20-20-20 rule in the 2nd article)
(Sorry about the wall of text, i might've gotten a bit too into this)
Sources:
https://www.healthline.com/health/is-dark-mode-better-for-your-eyes#about-blue-light https://www.aao.org/eye-health/tips-prevention/digital-devices-your-eyes
Tell me about it.. Since changing back to light mode after all these years, my eyes have felt a lot less sore in only a few days, its amazing.
That's fair, i've had used a few apps for long periods of time with light mode and it is pretty nice, although i'm biased towards dark mode. Maybe it also has to do with the enviroment around you? Since a dark theme while outside in a sunny day would surely put some strain in your eyes?