Any reference on working with lights on vs off? I've seen 1 or 2 people do that in office. I've been told that lack of ambient light might cause more strain. Is there any study supporting what you've said?
Only my own anecdotal study here. It's not total darkness, because I'm in a well-windowed cube farm (along a far wall that has no windows, though), so there's still a bit of ambient light.