I hope you guys don't mind the CNN link

http://www.cnn.com/2010/TECH/web/06/07/carr.internet.overload/index.html

I work in IT, and on my work days I spend 12 hours at the datacenter, so obviously I spend a LOT of time "peering into a computer screen," and I've noticed this effect myself. Seeing it in writing like that is a confirmation to me how important it is to make time every day to get outside, whether it be for fishing, walking the dog in the woods, weeding the garden, whatever.