There are anti-glare screens that help, and getting up and walking around that fights off the fatigue. There's always good old 'desk yoga.'
All electronic materials give off radiation and ions, even toasters, ovens, radio/clocks, TV's, etc.
I work in the corporate world and getting up and walking around, hooking up to the furthest printer, getting water breaks, etc, helps me from getting all conked out. You need to look away sometimes too, staring at a screen all day makes you mentally fatigued. I try to pepper my day with phone conferences, meetings, chatting with coworkers, reading printed material. Sometimes a lot of info is easier to read printed out and you can take notes on them. Yeah, I'm for paperless environments, but sometimes you need to print things out for your sanity. Keeping organized also reduces work fatigue and anguish. I also try not to watch too much TV when I come home and definitely turn the TV off at least 30 mins to an hour before bedtime. I read a magazine or do something else to let my eyes and mind rest and focus on something else.
Of course, a good breakfast and lunch during work time with plenty of fruits and veggies, lots of water to drink, and taking multivitamins (and an extra pill of B-Complex for stress, fatigue, and hormonal fluxes) help a lot.