Correct monitor flicker (refresh rate)
A flickering monitor can contribute to eyestrain and headaches. You can reduce or eliminate flickering by increasing the screen refresh rate. A refresh rate of at least 75 hertz generally produces less flicker.
You might need to change your screen resolution before changing the refresh rate because not every screen resolution is compatible with every refresh rate. The higher the resolution, the higher your refresh rate should be.
For more information about choosing the best refresh rate for your monitor, see Getting the best display on your monitor.
Open Display Settings by clicking the Start button , clicking Control Panel, clicking Appearance and Personalization, clicking Personalization, and then clicking Display Settings.
Click Advanced Settings.
Click the Monitor tab, and then select a new refresh rate. The monitor will take a moment to adjust. If you want to keep the changes, click Apply. If you don't apply the changes within fifteen seconds, the refresh rate will revert back to your original setting.