What's physically different in the way OS9 and OSX displays?

I used to have an iMac G4 (at work, in the USA) delivered with OS9 and OSX. Looking at the display under OSX made me tired and nervous, whereas using it under OS9 did not! No joke. (I find OSX a very good system and have no psychological bareer; it must be something physically different. What is it?)
Now I'm using a newer iMac delivered with OSX only and am suffering. I do not have that problem when looking at the LCD screen of another DELL PC at work or at a Thinkpad. However, with CRT-monitors I can easily distinguish if it runs at 72 Hz (=torture) or 85 Hz (O.K.).
If anyone could at least explain me the phenomenon with the iMac LCD, I'd be grateful...
iMac G4    

Welcome to Apple Discussions!
You may just need to calibrate your display's color
profile. Apple menu -> System Preferences ->
Displays.
This helps a bit but does not seem to solve the basic problem. Too bad I can't run OS9 on the same machine and adjust the color profiles under both systems so it looks similar, and then compare how it feels to work with both systems...

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