When you look at a newspaper, the letters are black which is a collection of many colors to attract your vision.
When you are looking at a monitor/tele the black letters are an absence of light. making you look into small voids (currently) surrounded by the bright white light (or any other color ) straining your vision and eyes.
Now that you know this, if you are a T.V. addict, (*you don't read, write, or do arithmetic) notice the color scheme on your favorite shows. Write down the patterns, enough to notice what happens dark to light for suspense ect., on and off to not wean you from your intrigue of entertainment, and light at the end to adjust / acclimate / accommodate you to a new adventure of the viewing mind.
*Blue is tele-crack(easy on the eyes)