You don’t realize how badly your eyes need f.lux until you have it, at which point you swear never to be without it. You have to see it to believe what a difference it makes. What does it do? It makes your eyes happy. As its website explains,
“During the day, computer screens look good—they’re designed to look like the sun. But, at 9PM, 10PM, or 3AM, you probably shouldn’t be looking at the sun. […] f.lux makes your computer screen look like the room you’re in, all the time. When the sun sets, it makes your computer look like your indoor lights. In the morning, it makes things look like sunlight again.”
Once you’ve got it running, and it’s night time, try switching back to the old, normal colors… It will literally hurt, whereas transitioning into the f.lux colors is like slipping into a warm bath.
Get it at stereopsis.com/flux.