Wednesday, July 04, 2007

Computer and cell phone screens strain the eyes

Computer vision syndrome or small screen vision ...

"Anyone who spends long hours reading and writing on video screens, big and teeny, can suffer from computer vision syndrome.

Sufferers experience such problems as: Headaches / Eyestrain and aches inside the eyes / Dry, irritated eyes / Blurred vision / Neck and shoulder pain / Sensitivity to light / Temporary inability to focus at a distance, sometimes called pseudomyopia.

While computer vision syndrome isn't a diagnosed disease, such as glaucoma, the term is useful for communicating what some patients experience daily, says Kent Daum, associate professor of optometry at the University of Alabama-Birmingham.

Computer vision syndrome began to emerge in the mid-'80s when computers got popular, and by the '90s it was recognized as a serious issue in the work environment.

The eyes react well to most printed material that consists of solid black letters on a white background.

But on a video display screen, the image isn't as good as printed copy. "The blacks aren't as black and whites aren't as white. You can't focus as well, and your eyes get tired quicker," Kent Daum, associate professor of optometry at the University of Alabama-Birmingham says.

The characters on a computer screen, called pixels, are brightest at the center and diminish in intensity toward their edges. This makes it difficult for our eyes to maintain focus and remain fixed on these images.

But that's just one way computers tax our eyes."    (Continued via textually.org)    [Ergonomics Resources]

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