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A refresh rate of ~60 hertz on a CRT monitor will often cause eye fatigue and headaches. This is occurs from a 'flicker' that the human eye barely catches, but is still there. To prove this, set your refresh rate to 60 hertz, and look at your screen from the corner of your eye. Usually, you will be able to see the flicker on lighter0coloured surfaces and are able to see this much easier out of the corner of your eye because your peripheral vision is more sensitive to movement.
Anyways, just imagine having this thing flickering at you for hours at a time day after day. Hurts my eyes just thinking about it.
Thus I swear by my refresh rate of 85 hertz at 1024x768 on a 17 inch monitor.
Hope I helped.
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