Some good comments here that I feel like implementing

@ColonelPanic001 : dark cube, overhead lights off, monitor at minimum brightness

@jisaacstone : large monitor, big font, keep it far away. Relax instead of leaning in toward the screen. I am often mentally tired at the end of day but no eye strain.

@a8da6b0c91d : get sunlight

@xbonez : try http://justgetflux.com/

@djb_hackernews : Personal experience on why taking timely care is important