Computers are a great work tool and a tremendous resource. Just think, without one you wouldn't be reading these helpful tips! But computer use can also result in headaches, blurry or double vision, burning eyes, dry eyes and other less than desirable side effects.

Your symptoms may be caused by the way you use your computer and sit at a desk, or could be the result of a vision problem. Your first step should be a visit to your eye doctor for a comprehensive exam.

Common eye-health problems that are magnified by increased computer use can include:

• Farsightedness. This can cause eyestrain and fatigue.
• Eye coordination difficulties
• Astigmatism
• Presbyopia (age-related focusing problem)

There are also a number of things you can do to arrange and use your desk, computer and chair to eliminate or minimize discomfort.

1. Adjust your chair:

• Feet should be flat on the floor with your knees bent at 90 degrees or more.
• Your back should be snug against the seat. Thigh to trunk angle should be at least 90 degrees
• The distance from the front of your chair to the hollow of your knee should be 2-4 inches.
• Your wrist and hand should extend nearly straight from the elbow to the home row of the keyboard.

2. Set up your work surface:

• For most people, the amount of legroom below the work surface should be about 25" high by 27" wide by 27" deep. Of course larger people may need more space.
• A work surface height for computer use is about 26" as compared with the conventional 29" of most tables or desks.

3. Your monitor and keyboard:

• Locate the monitor 16" to 30" from your eyes. Most people find 20" to 26" most comfortable.
• The top of the monitor should be slightly below horizontal eye level. Tilt the top of the monitor away from you at a 10 to 20 degree angle.
• Keep your monitor dust and fingerprint free. Both can reduce clarity.
• Adjust your keyboard tilt angle so that your wrists are straight.

4. Lighting:

• Adjust the brightness of the monitor to an intensity that is comfortable for your eyes. Eliminate bright light sources from your peripheral vision.
• Adjust the contrast so that letters are easily read.
• Minimize reflected glare on your monitor by using dimmer switches on lighting, window treatments and anti-glare screens. Look for monitors that have received the American Optometric Association Seal of Acceptance.
• Position your monitor perpendicular to windows or other bright light sources to reduce glare.