The tip above about "getting comfortable" should be carried a bit further here.
Holly has been getting a stiff neck and lots of headaches lately and she finally figured out why. Her glasses are bifocals and in order to read the screen on her computer she tips her head back to look through the bottom of the lenses. It dawned on her that the unnatural position has been putting stress on her neck muscles, making them sore and giving her a headache. At least that was her theory.
We went to the optometrist yesterday and he confirmed her intuition and recommended that she use her bifocal glasses for other activities but switch to a pair of reading glasses for viewing the computer screen. He's making a prescription pair for her now but in the meantime he suggested she try a pair of off-the-shelf $20 glasses from the pharmacy section of the store.
She bought two pair and brought them home. One pair is a +1.00 and the other pair is a +2.00 magnification. The +1 pair is great for when her nose is about 18" from the screen, as when she's going through emails or surfing the web. The other pair is better for when she's digitizing as they focus about 14" from the screen.
If you're having problems with a sore neck and headaches, your bifocals may be at fault. Try this simple solution. If it works, consider getting prescriptive glasses just for computer work.
