Headaches are a major reason people go for an eye examination. Computer-related headaches can be caused by a variety of things, including stress, eye conditions, improper placement of the monitor, glare and poor lighting. Since you blink less often during computer use, you may notice having dry eyes, which can cause eye irritation and problems with contact lenses. Check to see that your computer screen is positioned correctly for viewing, is clean, isn't reflecting glare and provides proper contrast.
Glare is often the result of direct, overhead lights, especially fluorescent lighting.
Most regular bifocals or progressive addition lenses aren't designed for computer use. Make sure the middle of your computer screen is four to nine inches below eye level. If you wear bifocals or progressive addition lenses and regularly feel neck and shoulder pain after working all day at a computer, it could be that you're too often tilting your head back to read the computer screen. Ask your eye doctor whether you need a separate pair of glasses for computer-distance viewing. Taking relatively simple steps, such as making minor adjustments in your work space, planning breaks to rest your eyes and wearing proper glasses, can make the hours you spend on the computer much more comfortable and productive.