I can only go on my own experiences, however soon after I got an iPhone X I started to get frequent headaches centrered around my eyes. Sometimes these headaches would get so bad that I would take some pain killers and go to bed very early.
At the time I didn’t realise what the issue was I just assumed I was getting old and my eyes aren’t as good as they used to be, I went to the opticians and he advised me my eyes are mostly fine just very slightly short sighted however the headaches didn’t stop after I started wearing glasses.
Fast forward a couple of months and I start to consider getting an iPhone XR mainly for the screen size upgrade and battery upgrade, during my research into the XR I discover the thread on PWM on the iPhone X and I look into it, I then suddenly realise that the headaches occurred when I used my iPhone in the evening and that it is likely to blame.
Fast forward to upgrade day, I trade in my iPhone X and get an XR and as if by magic my headaches and eye strains have gone and I can use my iPhone in a dark room without getting throbbing eyes.
So take from that what you will, however I do believe PWM in the IPhone OLED to be problematic to SOME people (my wife didn’t experience the same symptoms with her X) And I do believe a lot of what I see on that thread as I’ve experienced the same issues myself.
Sorry to hear that.
I have not read the study about it, you mentioned earlier but I may do. I have used AMOLED long before iPhone X so for me there is no issues.
But would be interesting to see how people are gonna react to MICRO LED since these would be much brighter.