The American Academy of Opthamology has some guidelines for healthy comuter use: http://www.geteyesmart.org/eyesmart/living/computer-usage.cfm. I think it is important to rest your eyes using the 20-20-20 rule: every 20 minutes look at something 20 feet away for at least 20 seconds. This ensure that you aren’t just focusing at something the same distance all day, and gives your eyes a break!
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