mike The main point here is that I have had great success with my training. But many haven’t
My theory is that training works with screens that use PWM, but not much at all with screens that use heavy temporal dithering. For example, one of my old Windows laptops has some mild PWM (but disabled dithering) and I can use it totally fine, and I can also tolerate my iPhone 14 Pro for basic phone use stuff at this point, especially outdoors (still get dizzy when trying to do more complex work on it though). Sometimes I just naturally/instinctively covered my right eye while using my iPhone which helps in that case.
However, on heavily temporally dithered LCD screens, trying to cover one eye doesn't seem to work at all for me and can actually make the screen feel worse at times, like I can't keep anything in focus.
And even before I learned what temporal dithering was, the longer and longer I used screens affected by it (without even knowing my pain was coming from the screen), I would just feel worse and worse. So it's not "adjustable to" in the same way that screens that only use PWM are IMO.
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As a side note, I don't think I can adjust to PWM lightbulbs at all though. I mean, the house was lit by flickering LED bulbs for years, and before I even knew about PWM I would always be turning the lights on and off because I was always thinking they were "too harsh" or almost "too bright and too dim at the exact same time". It always felt like the lights "felt weird" in the house, no matter what I was doing.
I could never get used to those bulbs (which had 100% flicker depth at 120hz, ugh), even before I knew why.
After changing the house out to PWM-free Waveform bulbs, I've literally never had any issue with the lights at ALL since, I just leave them on constantly and they feel like the perfect level of brightness at all times!