Soreeyes I hear ya...
Thing is I have exhibit a) good working 2010 PC on W7 and exhibit b) ? iMac/Nvidia PC/Nintendo Switch - both going through the same monitor, one good, one unusable.
I can rule out LED (at least in my case) thankfully.
I think that all devices dither now, hence more static/flickering than ever before, hence tired/strained eyes.
Flicker/moving patterns up close can't be good for you in any shape, size or form. The fact that 'experts' claim dithering is impercetible is where their argument falls down. I see the dithering pattern, I see the flicker.
A modern iPhone makes my pupils dilate (scary).
This tech can't be good for anybody, not just the people on this forum.