I could not use iPhone X and IPhone XS Max. I tried and got eye strain on the X and headaches and severe migraine on the XS Max. I am perfectly fine and healthy on iPhone 11 Pro, but some other people who have had trouble with the other models still have trouble with the Pro.
All I know is what is stated in their own literature on their own web site and that is they have new display drivers and new software for their new display requirements. So yes, there have been some changes made but precisely what these changes are and what they mean for people who can’t use Apple’s OLED display is still not really known.
From what I have been able to theorize looking over various sources, it wasn’t just pwm alone making some of us sick. It was how Apple implemented a custom display specification at the sub pixel level that might have been making things extra screwy for some of us. Others of us who just have a straightforward pwm sensitivity likely still will suffer adverse symptoms.
I am still sensitive to the technology in the Face ID. I will get dry gritty eyes and a weird feeling in my eyes if I mess around making Animoji. Lol I know it serves me right!
If I turn off attention aware and adjust the settings so that the dot projector and flood illuminator should only be firing when I use Face ID, my eyes are fine. Ordinary daily use of Face ID doesn’t make me uncomfortable.
But when I was setting up my phone from scratch and had to use Face ID more than normal to authenticate all of my accounts, I did have gritty dry eyes for a day.