This was exactly my experience. iPhone 15 pro gave me eye fatigue, nausea, etc. Returned it and got a 15 plus, which has been fine for me. I looked at the OLED m4 iPads in store and had the same symptoms within 5-10 minutes. I purchased a 13" m2 air and love the screen, no issues. Additionally, I found the 13" iPad Air screen much better than the 11" m2 air screen. I don't think it's a promotion thing because my old 2020 iPad Pro 12.9 gave me no problems. Perhaps it's some combination of PWM and panel manufacturer?I did with the iPhone 15 pro, the 15 plus has no issues for me.