First time I have experienced eye strain was two months ago, with a Samsung S 20. Before that, I have been using Samsung S7 without any problems for 2 years and an Samsung S 10e for about a year.
With S10e I had problems in beginning, but I did not give too much attention to it , and now I could see why was that happening.
I was using Apple iPhone SE 2020 since release, without problems. Then, I got a goid deal for S20 5G and I purchased it. It was first time that I experienced so heavy headaches and strain from one device. Returned it in 3 days.
Then, I thought, it was because OLED, i will buy iPhone 11, it will be the last iPhone with IPS LCD. It was not so bad as S20, but I would get headaches after a day of very light usages, just checking sms and emails. So, iP 11 whent back, I am again on SE 2020.
Currently, I am also using iPad Mini 5 and MacBook Pro 13 2019 without problems ( knock, knock ).
Would also love to hear experiences with another devices, but I think that it is the end of the road regarding Apple devices for me.