An article from CNet by Sharon Vaknin
Try these 5 hints below to put less strain on your eyes and decrease discomfort:
1) The actual distance from your eyes to the screen can cause significant strain. A generally accepted distance is from 20 to 30 inches. Too far or too close and you could be damaging your eyesight. It’s also important to have the center of your screen at a slight downward angle so you’re not looking up putting stress on your neck.
2) Another good tip from Digital Inspiration is to stare at an object 20 feet away for 20 seconds about every 20 minutes. This gives your eyes a quick break from having to refocus on a computer screen.
3) Lighting is very important on alleviating strain on your eyes. There is the backlighting from your computer and the typical fluorescent lighting in the office setting. “Light should never be directed behind or in front of your screen,” Sharon Vaknin advises. Indirect lighting is the least straining on your eyes.
4) If you switch between multiple computer screens frequently, then make sure that they’re either parallel and within the same distance. Your eyes will have to refocus every time you look from one screen to another. If they’re the same distance apart you’ll put less strain on your eyes.
5) If it’s impossible to adjust the lighting in your work environment, you can buy computer glasses designed to work like sunglasses. They will block the harmful sun light from damaging your eyes. Although they’re typically a bit pricey and not the most fashionable, they will help reduce the strain on your eyes considerably.