Breaks are important! Short, frequent breaks are better than longer, less frequent breaks. Try 2-3 minutes every 15-20 minutes, 5 minutes every 30 minutes, or 10 minutes every hour.

Do eye exercises and acupressure massage points every hour on the computer - we have a free eye exercise e-booklet, but also have now published a comprehensive book on healing your eyes naturally, which includes exercises, massage, etc.

Set up your computer correctly. The proper viewing distance is 20-24 inches. The correct viewing angle is 10 to 20 degrees from the midscreen to the top of the screen.

Use a good monitor. Usually the higher the resolution (the more pixels) the better. Monochrome displays usually have better resolution than color. For color monitors, look for smaller dots per inch (less than .28mm). Higher refresh rates (flicker speeds) are preferred, at least 70 Hz. Make sure the monitor has a high enough illumination to match the surroundings (be aware that antireflection screens reduce illumination).

Use proper posture. This includes a tucked in chin, slight curve at the neck rather than a forward head and neck, a straight upper back with only a slight roundedness, and hollow in the low back.

Make sure overall illumination of the room is no more than three times brighter than the screen

Adjust screen brightness and contrast properly.

Use a desk lamp if possible instead of an overhead light.

Control glare from overhead lights and uncurtained windows. Use an anti-glare screen, or move your terminal to an area of limited glare.

Keep your wrists relatively straight while typing to avoid carpel tunnel syndrome. Wrist support pads can be very helpful.

If you work in a cubicle, try to give it a feeling of more expansiveness by, for example, placing a mirror on one of the walls to create the illusion of more space.