Computer eyestrain is a common problem affecting between 64 percent to 90 percent of office workers.

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The most common of these are eyestrain, double vision, temporary short-sightedness and visual fatigue.

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There are also concerns about eyestrain and the potential for vision damage in small children.

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Gunnar Optics is currently offering 20 to 30 percent off many of its anti-eyestrain computer and gaming glasses.

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"The top one-third of the monitor should be above eye level, both to decrease both eyestrain and to prevent hunching, " he says.

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"The top one-third of the monitor should be above eye level, both to decrease eyestrain and to prevent hunching forward, " he says.

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As phones and tablets merge, manufacturers must find that sweet spot between a device that's easily portable and one with a screen big enough not to cause eyestrain after an hour or two.

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The eyestrain and queasiness from 3D is caused in part by 24 fps, and Jackson avowed that he and his crew haven't experienced any of that, even after "thousands of hours" of watching 3D Hobbit footage at 48 fps.

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