Watchful eye moisturizer is the best prevention. Pay attention to eye habits, regular breaks, continuous computer screen at the time not too long ago, every 1 hour to rest for 5-10 minutes, try to relax your eyes while overlooking the void. Eyes inward, looking down, so at rest, try to make the eyes look to the upper left and right. People at rest, but also the activities of the neck and shoulder muscles, stiff neck muscle disorder because affects vision. Students also pay attention to diet, more vitamin A, C, D, eat carrots, fruits, seafood and so on.
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