Desktops and laptops have been around long enough for usage guidelines to be established, but not so with tablets, which strain users.
Love your iPad? Take care how you use it. As convenient as iPads and other tablet computers are, they can cause physical problems because people often peer down at them in their laps. Viewing a computer screen is less stressful on the body when users are seated looking straight at the screen, not from above or below.
Desktop monitors and laptops can also cause problems for their users when placed too low, forcing their user to hunch over to see the screen. This places a strain on the neck muscles and can lead to pain and discomfort. Neck pain isn't just an annoyance; it can have serious consequences. A 2007 study found that chronic neck or back pain was the leading national cause of missed work days.

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Desktops and laptops have been around long enough for their ergonomics to be investigated and usage guidelines to be established. Tablets are new enough that there's little information available. Researchers from the Harvard School of Public Health recently conducted a study on how people use tablet computers and hope that their findings will help users place less stress on their bodies while using these devices.