Q:
A: Refresh rate was based on the scanning of the CRT tube per frame. In the bad old days of computing, when video was in it's infancy, the refresh rate was slower and eye strain was a major problem (remember it and want to forget it!). 60mhz is the lowest on a CRT monitor a person can tolerate, as it's the slowest where the human eye can detect the refreshes. Any lower eye strain increases due to the constant flickering (ever took a screen shot of a monitor? Notice the white scan line? That's what the eyes notice even though not visually detectable to our brain). Refresh rates are hardwired to specific models of monitors, so if 85mhz works on one, it can damage another (which is why you must not increase the scan rate even if your videocard can go past 100mhz, if your monitor can only handle 75mhz -- why with Nvidia cards it's best to hide unusable refresh rates to not accidently select the wrong one). Turning up the refresh rate just to do so adds nothing to the visual quality, but makes the videocard work more. Which is why it's best to stay at the recommended high range for the monitor, not any more. It's wasted I/O bandwidth, that's better spent on increasing frames per second in games and videos.
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