Changing the refresh rate in windows

The refresh rate is technically the vertical scan frequency what this does is specify the times the scanning beam redraws the screen per second in CRT monitors. CRT’s have phosphors that stay bright for a fraction of a second so they need to be constantly hit with electrons to stay lit to the human eye. The propose of changing the refresh rate is to reduce headaches after staring at your screen.
Some computers monitors screens refresh rate is too low and the screen flickers. Some users may be accustomed to the flicker, or their eyes are not sensitive enough to detect it, but the flicker is there. And till it flickers, it will irritate your eyes and cause eye strain. Higher refresh rates are less likely to cause eyestrain