Today's society increasingly developed, information technology also was very popular worldwide. But not this is totally useful. Because information technology development, products such as computer, smartphone, Ipad, ... also many phrases. The teenagers were dependent on the computer too much. They spent all free time to play games on the computer and it can cause many harmful effects such as myopia. The majority of children today are suffering from myopia because sitting too long in front of your computer. The brightness of the computer and the radiation exit can cause blurred vision and dry skin
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