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'During computer use,' said Heiting, 'our eyes have to stay focused for long periods of time.' The glasses people use for driving or the ones they use for reading books often have the wrong focal point for computer use or are ill-suited for computer use. Gary Heiting, an optometrist and associate editor of, a consumer information site, said people should 'resist the temptation to buy over-the-counter reading glasses for use as computer glasses,' he told the New York Times. Prescription computer glasses help the eyes focus on that middle area.

Reading glasses are for closer focusing, while regular glasses are for longer distances.

The problem is, computer monitors are at an intermediate distance. Older workers who try to make do with bifocals, trifocals or reading glasses may only increase eye strain symptoms, the Florida researchers said, especially if they need to scan back and forth between printed material and the computer screen, or between multiple monitors.

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The symptoms of eye strain - blurred vision, neck and shoulder pain, headaches, dry eyes - affect up to 90 percent of workers who spend hours a day peering at a computer, says the American Optometric Association.Р”Р‡or older adults, in particular, the problems are compounded by presbyopia (the condition that makes us need reading glasses as our eyes age), plus a greater need for more lighting, less glare, and a different viewing distance between the monitor and our eyes compared to younger workers, say vision experts.Р”Р„ 2008 studyР’В by Florida State University researchers found that poor lighting and screen glare contributed significantly to eye strain for older workers.Р’В Studies also show that workers over 50 need 'twice the light levels of younger workers for comfortable work,' the optometric association said. For those of us spending more and more time gazing at a computer screen, it's proving to be -literally - a pain in the neck.Р’В And in the head.