Did you find any solution to your problem or have you considered going to an eye doctor? I am having similar problem as you. I think maybe I spent so much time looking at screen from ages 5-30 that I must have damaged something, because take for example the Ars Technica news site, light mode or dark mode, I will literally read any article for just 3 minutes, and look away, and I will be "blinking lines" in vision, its very frustrating...
Any advice or anything you have learned from your journey would be welcome. I tried Gunnar Computer glasses, it does help some, but doesn't fix the Ars Technica problem.
I try to take lots of breaks and go outside. I also try to eat more healthy food, like carrots and such. I also tried an "eye supplement" once, not sure if it helped or not really, not really I guess, but its hard to measure stuff like that.
I read you are supposed to look at something far away for 15 minutes every hour you stare at the PC. so a 15 minute break every hour. This does help me some, but again does not fix my Ars Technica problem.