Sorry for necro, but I believe i have found the solution for that problem. For years i had the same problem: immediate eye strain and light dizziness from just looking at the game screen, even at login, only from WoW. 30 min later the eyes started going red and it felt like i was playing 10+ hours straight. I thought maybe that was all just because of the 60Hz monitor, but i could play all day long in any vivid fast paced FP Shooters, with no bad effect to my eyes.
A couple of weeks ago i bought a new monitor, IPS, 144Hz, same 1080p res. It didn’t help, even with freesync and stable high fps. But then i saw some additional ingame video setting, that when activated make appear a slider. Im talking about System-Advanced-Ambient Occlusion Type - FidelityFX CACAO - now check it and to the right of it push the slider “Resample Sharpness” to the “2.0” position, far to the right. Apply. Difference is immense. That’s all, nothing else in the graphic setting seems to help, thought i did restrict max fps to make it a stable number, disabled V-sync, depth effects, SSAO.