I apologize for taking sooo long to get back to you on this: I own a pair of Sphere Halogens. I bought them since I felt at the end of the day(having stared at the screen for hours together, that I had eye-fatigue, related headaches and dryness.) After trying out the Halogens for a few days, instant relief! I would say it is totally worthwhile expenditure if you feel eye fatigue; obviously a whole lotta people seem to do good without them...so good for them. They have really helped me alleviate my eye-fatigue and I can now work longer on my computer and follow-up on other things in life after having worked on computers, without feeling burnt-out. Hope this helps.

Newegg actually sells non-prescription Gunnars. I've been looking into those since I'd like a pair of computer glasses to try.

And if you thought finding a dealer was hard, I'm having a hard time finding a dealer that'll do prescription lenses, unless I'm overlooking something completely obvious and all of them can do it with an eyeglass prescription...doh.