ensete I'm thinking - if my eyes are perfectly fine, as in I've slept well, I'm not dieting to lose weight or have had a flu or anything, I'm able to watch any screen that does not have PWM for any period of time without problems. Now as my eyes are somewhat constantly irritated since my last new phone try out, I do seem to get symptoms from my old Sony Z2, which was problem free previously.
The eye doctor noted that my eyes are slightly dry, which might not cause symptoms. Also the meibomian glands were slightly infected, inferring that they oil based lubricants that they secret, are not secreted adequately.
Maybe the Z2 has some mild temporal dithering and when my eyes are already a bit dry and irritated, then my eyes are not able to tolerate even mild irritation.
Could it be that ensete you have similar situation, but more chronic, so even any mildly irritating screens cause problems. Oh well, then again, good screens should be exactly as a book when read in natural sunlight. Do you get any eye irritation when reading a book?