Vision problems plague computer users
Computer Vision Syndrome now affects 91 percent of all computer users, according to the National Institute of Occupational Health and Safety (NIOSH).
In technical terms, Computer Vision Syndrome (CVS) is defined as a combination of symptoms that begin occurring after two hours of continuous computer use. Common symptoms include headaches, focusing difficulties, burning eyes, tired eyes, general eyestrain, aching eyes, dry eyes, double vision, blurred vision, light sensitivity, and neck and shoulder pain.
The villain causing this collection of problems is the pixel, the tiny square dot that forms when an electronic beam strikes the rear surface of the chemically treated screen. The eye has a problem focusing on pixels, which fade in intensity from a bright center to the edges. Tiring quickly of trying to focus on the computer screen, the eye relaxes continually to a point behind the screen known as the dark focus or RPA (relaxing point of accommodation). This constant flexing of the muscles of the eye is what causes eystrain and headaches.
The solution is corrective lenses that focus on the screen itself so that the back-and-forth focus mechanism is eliminated. Special measurements for glasses designed for computers are based on the distance of the eye from the computer rather than on the normal reading distance for books and other printed material.
Other ways to reduce the strain of heavy computer use include the following—
- Glare screen filters. These devices affect glare only from the computer screen, but may be helpful to some workers.
- Better lighting. A room where a computer is being used should have about half the light level of a typical office area. Outdoor light should be shaded to reduce glare.
- Breaks. By looking away from the screen every 10-15 minutes and focusing on something in the distance, or getting up and taking a short walk, you can reduce eyestrain and other symptoms of vision overuse.
- Ergonomics. Be sure your screen is at eye level, your arms from elbow to wrist are parallel to the floor, your feet are flat on the floor or on a footrest, the computer is directly in front of you, and your back is straight and comfortable.
Griffith Publishing 800 359-9503
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THINKING POINTS
Computer screen-related vision problems are at least as serious as musculoskeletal disorders, according to the American Optimetric Association
According to the Science Blog, research suggests that one of three complaints about computer eyestrain are really complaints about working conditions in general.
Glasses that correct for the computer screen are now available from virtually all eye doctors and vision specialists.