Need suggestion for computer eyeglasses

[glass frame]

I just want a pair of non-prescription eyeglasses for office using, I am not near-sighted, but my eyes always get strain and fatigue after long time working on computer, so, what kind of lenses are most suitable, are lenses with no Rx are cheaper than those have Rx, I am 54 years old men and not interested in designer, fashion etc, and I need eyeglasses with special lens coatings which may provide me radiation protection, what do you suggest?