Valve Index & Oculus Rift CV1, Asus Strix OC RTX™ 3090, i9-10900K (5.3Ghz), 32GB 3200MHz, 8TB
"Ask not what VR can do for you, but what you can do for VR"
I have the exact same issue and even after I take it off my eyes are strained for hours after. The longest I've played on my Index was 5 hours straight and I never had any eye strain at all. On the Quest 2 I can barely manage 30 minutes. I'm sending mine back. I've never tried the previous Oculus products and now I'm afraid to. 😮💨