When I was a kid I learned that the CRT screen refresh rate must be set to at least 60Hz otherwise it looks like crap and is pain to look at. My cousin had his set to some lower value and would claim not so see any issue. His father said "I don't know how these damn kids stare all day long at the screen, I stare half an hour and I get a headache!" because you're one setting away from not having the headache but you won't let me change it because reasons.
My parents have a plasma TV and I can clearly see it flicker, although it doesn't cause any pain.
My parents have a plasma TV and I can clearly see it flicker, although it doesn't cause any pain.