What an excellent application! They do not come any easier to install and use. Simple, yet elegant. It does exactly what it says it does- allows one to change the screen color to preserve night vision (very handy for astronomers). At the same time, it permits those of us with very light-sensitive eyes to change the color to something less annoying. Imagine looking at this bright, white screen as a muted lavender; or whatever strikes one's fancy. It is also just fun to use. Try it!