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The displayed image seems to be flickering, which is causing eye strain and fatigue
Explanation: The image on the screen seems to flicker when you look at it, particularly when there is a lot of white on the screen.
Diagnosis: Flicker is caused by having the refresh rate set too low. The video image is sent to the screen many times per second because each time it is drawn, it quickly fades. If it is not refreshed fast enough you can see the previous redraw begin to fade before the next one takes its place. The result is visible flicker. Some people notice this much more than others, and it is more visible on larger screens than smaller ones. See here for more.
Recommendation: Raise the refresh rate of the video card, making sure not to exceed the maximum allowable refresh rate for your monitor at your chosen resolution setting. The refresh rate is normally changed either by selecting it in the video driver configuration utility that comes with the video card, or through a Properties setting under "Display" in the Control Panel of Windows. If you are having problems setting the refresh rate, look at the entry just below on this page.