Varies: When working at near tasks, it is important to rest the eyes for at least 15-30 seconds for every 15 minutes of near work.
Answered 9/2/2015
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It depends: If you are briefly checking email messages there is less likelihood of eye strain than if you spend an hour in front of the monitor. But if you have dry eyes or an uncorrected prescription (farsightedness, astigmatism, presbyopia), you may experience strain or fatigue much more quickly.
Answered 12/8/2014
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