In the old days it was simple, anything less that a 75 Hz refresh rate on a CRT monitor hurt my eyes. Now things seem more complicated. As a programmer I spend a lot of time in front of my monitor, or using an android device (usually Nexus 7 (2013) or 10). I have upgraded my Samsung T260, for a Dell U2713HM. There is certainly a significant difference, but I still get eyestrain and headaches.
I tweaked all the settings, font size etc., use a program called f.lux. Should I get a monitor with a higher refresh rate? (I was originally told that refresh rate makes no difference to LCD, but that seems to be contradicted by some modern monitors and TVs) And what about Android - don't think I've seen anything about their refresh rates?
Obviously it may be something other than refresh rate, but I am at a loss...