Comment by cm2187
2 days ago
I think you are right, I had the LC III and Performa 630 specifically in mind. For some reason I remember they were 30Hz but everthing I find googling it suggest they were 66Hz (both video card and screen refresh).
That being said they were horrible on the eyes, and I think I only got comfortable when 100Hz+ CRT screens started being common. It is just that the threshold for comfort is higher than I remember it, which explains why I didn't feel any better in front of a CRT TV.
Could it be that you were on 60Hz AC at the times? That is near enough to produce something called a "Schwebung" when artificial lighting is used. Especially when using flourescent lamps like they were common in offices. They need to be "phasenkompensiert" (phase compensated?/balanced), meaning they have to be on a different phase of the mains electricity, than the computer screens are on. Otherwise even not so sensitive people notice that as interference/sort of flickering. Happens less when you are on 50Hz AC, and the screens run at 60Hz, but with flourescents on the same phase it can still be noticeable.