January 11, 2012, 4:05 PM — Spend five minutes on any busy street corner and you'll spot people using tablets and smartphones in dangerous ways, whether it's texting behind the wheel or strolling with their eyes on the screen.
But distracted driving and walking aren't the only perils lurking behind touchscreen devices such as iPads, iPhones, BlackBerrys, Windows Phones, and Androids. Although not quite as dramatic, other touchscreen-oriented health hazards are even more insidious because most people aren't even aware that they exist. The potential for injury from using touchscreens will only go up as more people use smartphones and tablets, especially if Microsoft's Windows 8 effort succeeds in popularizing touchscreen PCs and laptops.
Ergonomic risks are not new to computer users. Laptops and netbooks, whose sales now outnumber desktop computers by more than two to one, pose their own health-related problems. But the rise of the touchscreen means both new kinds of health hazards and more usage in risky scenarios.
[ Watch the "Safer Computing" guide to preventing repetitive stress injuries in your workplace: as a video or as a slideshow. | Learn why touch capabilities in Windows 7 failed and what Microsoft has in store for Windows 8's touch plans. ]
After decades of research on machine-human interactions, medical experts have pinpointed three categories of computer-related illnesses, both in traditional PC use and in the new class of touchscreen devices:
Repeated motion injuries. Commonly known as RSIs, for repetitive stress injuries, these ailments result from recurrent large or small movements that affect joints, muscles, tendons, and nerves. For example, people who frequently use their thumbs to type text messages on cellphones sometimes develop de Quervain syndrome, a painful affliction that involves the tendons that move the thumb. Although the causal link isn't as well established as in patients who suffer from pain from prolonged desktop keyboard use, there's little doubt that overzealous texting can cause debilitating pain.