https://tieba.baidu.com/p/8791460458
One factor I noticed that's not mentioned in the consideration of eye-friendly LCD smartphones on LEDStrain is the display manufacturer and the year it was made. When I went back to China last year, I bought two used iPhone 8Plus with the display LG 2020 and JDI 2019, respectively; they both caused eye strain. After browsing that Chinese forum, I learned that for iphone 8plus, displays(regardless of the manufacturer) made after the second-half of 2018 are mostly garbage.