Most CRT's were OK, except Trinitrons. I have no idea why Trinitrons were bad. The refresh rate didn't seem to be such an issue at all. I could tolerate 60Hz and 120Hz no problem, if it was not a Trinitron. I used during 2004 to maybe 2009 a CRT at work, as all laptop screens back then were extremely problematic, due to PWM. But I did not know it was the PWM back then.
TV's are OK, except now the new TV's. Cannot use any Samsung TV as they have 240 Hz PWM. My Sony TV is OK, as it does not have PWM. I had an OLED TV for a week, but it was unusable as it had the 240 Hz PWM.
I have zero problems with any motion sickness or anything similar. I can game FPS games the whole night if I want, if the monitor does not have PWM or dithering.
I have not really tried with my other eye covered, but I have noted that if I sit in a meeting where the display has PWM or there is a DLP projector which flickers, I avoid watching the screen as much as possible but the eye that is not "behind my nose" to the screen, i.e. the eye that gets most of the flickering light from the screen, gets irritated more.
So I do not think my situation has anything to do with eyesight or dry eyes or anything like that. It's that my nervous system is sensitive to the flicker and that causes the bloodshot eyes.
Any time I'm in a meeting at work and I have to watch a 240Hz screen for a couple of hours, my eyes get red in 15 minutes and the next morning they feel dry and a bit like I'd have some sand in my eyes.
But the interesting thing is that at work all the screens flicker and many times I notice that after a meeting many others have also red eyes. Once I even paid attention to a very tan guy, who seemed to have very white eyes in the morning he attended the meeting, but after the meeting he had bloodshot eyes like I did. I noticed this because of his tan as the white eyes kind of popped from the tan skin, then suddenly he had bloodshot eyes.
I think so many people are sensitive the the PWM, but just don't realize it. Keep applying eye drops for dry eyes. I have tried literally every eye drops there is in the pharmacy over 20 years, but they might bring just a temporary relief if the irritation is really bad, but give no relief the actual problem - drops will not prevent eyes becoming bloodshot and very irritated if I have to watch a flickering screen for a day or so.
What amazes me is that I have been to tens of eye doctors and neurologists over the years, but literally none of them recognize the problem. I have showed them articles from Notebookcheck.net about PWM and from other sites, tried to explain about the flicker. They just claim that the eye is incapable of sensing over 120 Hz.
But a funny thing one eye doctor told me - kind of got caught herself "I see a lot of even 16 year old patients nowadays with dry eye problem - previously dry eyes were only diagnosed in menopausal women. (Low estrogen causes the glands to produce less lubrication)" Well - if it is not the flicker from all the displays, why does she get 16 year olds with the "dry eye"?
It would be an accomplishment to finally get even one single eye doctor or neurologist to understand that IT IS THE DAMN FLICKER, it is not the dry eyes. Because, the people who are sensitive to PWM do not get the claimed dry eye if the screen does not flicker, period.