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I'm surprised they don't mention the difference that can be caused by different types of monitors, eg, CRT vs LCD, size, display technology, settings, etc. For instance, a CRT generally has a thick glass in front, which forces the eye to refocus from the front to the back of the glass constantly, contributing to eyestrain. LCD monitors have less of a boundary between LCD pixels and the front of the screen, causing the eye to work less to focus. Settings can also be adjusted to combat contrast and glare issues, for example.
That's the least they could mention here... other aspects of display technologies also affect vision, but it's obviously just a summation.
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