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By 2050, half of the world’s population (nearly 5 billion) will be short-sighted, research suggests, and screens are to blame. 研究显示，到2050年，世界上的半数人口 Up to one-fifth of the short-sighted population (1 billion) is at a significantly increased risk of blindness, says the study published in the journal Ophthalmology. 发表在《眼科学》期刊上的这项研究还指出，这些近视人口中的五分之一 The rapid increase in the prevalence of myopia globally is attributed to, "environmental factors (nurture), principally lifestyle changes resulting from a combination of decreased time outdoors and increased near work activities" – time spent looking at screens, say the authors from University of New South Wales Australia and Singapore Eye Research Institute. 研究作者、来自澳大利亚新南威尔士大学和新加坡眼科研究所的专家表示，全球近视人数的快速增长起因于“环境因素”，“主要是人们生活方式的改变——户外活动变少、费眼力的活动增多”，而费眼力的活动主要是人们对各种电子屏幕的使用。 High income countries are most at risk of myopia, the researchers say, simply because the people living in those countries spend more time looking at their television, or phone, or laptop. 研究者称，高收入国家的人尤其易患近视，因为这些国家的居民花在看电视、玩手机和浏览笔记本电脑上的时间更多。 | 
