I have problem with OLED, IPS but not TN and CRT, but funnily enough, my Realme 9 pro IPS is fine. Things happen and now I own Retroid 4 Pro, no burning eye, no dry eye symptoms, but nausea and feels like vomiting, try to change anything software side via adb didnt do anything. So i bite the bullet and try polarization.
Tested with polarized glasses for fishing.
My TN monitor, Samsung S33A is dark 45 degrees counterclockwise

My Realme 9 Pro, circular, very little dark or close to none
My Retroid Pocket 4 Pro, dark on Vertical
So i buy a polarization sheet, set it to 45 degrees, cut it and applied it

ignore the ugly bubble, I tried to re-apply it multiple times, but it keeps getting worse lol

The result:
Clear Horizontally

Clear Vertically

Dark on 45 degrees clockwise

Now, does it remove the symptoms completely? No, at least so far no
does it make it better? somehow yea
Played ZZZ and Wuthering Waves for roughly 15 minutes this morning, headache and nausea.
Took a nap and this afternoon after I applied the film, played for roughly 15 minutes. Less nausea, the feeling of wanting to vomit appear only on the first few minutes
Still gonna test it for around a week if it's getting better
if not, I'll try tracing paper