I heard of that black screen is the best for eyes because dithering or other fancy method is not needed to make black "color". But I recently found out that a black screen embedded in windows screen really hurts me. The black screen I am talking about (see attached image) is very similar to a linux terminal window. I use the software PuTTY to connect to a linux server from windows machine. Once this small black window is on, I will get headaches in seconds, even on the the windows 7 machine I have been very comfortable with. I tried to maximize the black window to cover the entire screen, but it does not help.