Fatigue: Although each of the causes you provide are possible, i would suspect fatigue and address this first by resting with eyes closed for five minutes every hour.
Answered 3/26/2013
5.9k views
All of the above: All of those issues are involved in this issue. Take breaks periodically and use artificial tears to lubricate your eyes to avoid these issues.
Answered 8/30/2012
5.6k views
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