@Goyo Developing and processing photos is almost like meditation for me, I love it. I can sometimes find that kind of peace at the computer in photoshop, but my eyes tend to get tired from the screen..
@syjes You are so right, I don't even want to know how many hours a day I look at some sort of electronic screen....ughhh.
I do know something that helps though, it's a program called F.lux and it adjusts your screens color temperature depending on the type of day. It looks weird at first, but you get used to it quickly and it really does make the screen easier on your eyes. http://justgetflux.com/ Don't ever use it while editing photos our doing graphics though!!