Screen Flicker
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The technology
used in a CRT monitors causes the screen to flicker no matter what setting, according to PC Review UK. But increasing the refresh rate on a CRT reduces eyestrain. If you want to reduce the effects of flicker, set your CRT to refresh at at least 72 hertz--but higher rates are better and 85 hertz provides an optimal screen to reduce flicker.
CRT Monitors & Eye Strain | eHow
