Tip: if you're suffering from #EyeStrain looking at an LED or OLED screen, try setting the brightness to 100%.
This is by no means guaranteed to solve your problem, but it might.
The reason it might solve your problem is that a lot of such screens implement less-than-100% brightness by rapidly flickering (technically called #PWM dimming), which some #eyes are sensitive to.
I'm suffering from eye strain myself and I'm not sure yet whether this helps me. We'll see. But maybe it'll help you.
This might not work on OLED screens because they're doing dimming per-subpixel, and unless every pixel on your entire screen is completely monochrome (either full black or full white), some subpixels are going to be somewhere between 0% and 100% brightness anyway.
But it should work on LCDs, where subpixel brightness is controlled separately (by doing things to liquid crystals) from backlight brightness (which is done by the aforementioned flickering).
There's another reason this might be effective - your pupil size impacts your depth of field, and for the same reason that "squinting" makes it easier to compensate for myopia, smaller pupils make focusing easier. This means that, eg, computing in a dimly lit room is more taxing on the eyes than computing in a well-lit room.
Of course... indoor fluorescent and overhead LED lights also are modulated, often as a side effect of being AC powered, so that flicker can cause problems, too.
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