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首页> 外文期刊>BMC Ophthalmology >Different patterns of myopia prevalence and progression between internal migrant and local resident school children in Shanghai, China: a 2-year cohort study
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Different patterns of myopia prevalence and progression between internal migrant and local resident school children in Shanghai, China: a 2-year cohort study

机译：一项为期2年的队列研究，中国上海市内部流动人口与当地居民学童之间不同程度的近视流行和进展

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In 2010, there were ~?36 million migrant children under 18 y old in China. This study compared patterns of myopia prevalence and progression between migrant and resident children. Eight hundred forty-two migrant children from 2 migrant schools and 1081 from 2 local schools in Baoshan District, Shanghai, were randomly chosen. Baseline measurements were taken on children in grades one through four, and children in grades one and two were followed for 2 y. The children underwent comprehensive ophthalmic examinations, including cycloplegic refraction and axial length. The average time per week spent on homework and outdoor activities were investigated. Migrant children in grades one and two showed a lower myopia prevalence than resident children; however, from grades three to four, the prevalence accelerated and exceeded that of residents. In the follow-up, the myopia incidence did not significantly change from grades one to two in resident children but was significantly higher in grade two in migrant children. Correspondingly, for migrant children, increased progression of refraction and axial length was observed; however, it decreased in resident children. The average time spent on homework increased from grades two to three in parallel with the acceleration of myopia prevalence for migrant children; however, the time spent outdoors did not correspondingly change. The patterns of myopia prevalence and progression are different between migrant and non-migrant children. The acceleration of myopia in migrant children might be a result of a change in their environment, such as intensive education pressure.
机译：2010年，中国约有3600万名18岁以下的流动儿童。这项研究比较了流动儿童和常住儿童之间的近视患病率和进展模式。随机选择了上海宝山区2所民办学校的422名农民工子女和2所当地学校的1081子女。对一年级至四年级的孩子进行基线测量，对一年级和二年级的孩子进行2年随访。这些孩子接受了全面的眼科检查，包括睫状肌麻痹验光和眼轴长度。调查每周在家庭作业和户外活动上花费的平均时间。一年级和二年级的流动儿童近视患病率比常住儿童低;但是，从三年级到四年级，患病率加快并超过了居民。在随访中，常住儿童的近视发生率从一年级到二年级没有显着变化，但在流动儿童中的二年级显着更高。相应地，对于外来儿童，观察到屈光度和轴长增加。但是，常住儿童减少了。随着外来​​儿童近视患病率的提高，花在家庭作业上的平均时间从二年级增加到了三年级。但是，花在户外的时间并没有相应地改变。流动儿童和非流动儿童的近视患病率和进展方式有所不同。外来儿童近视的加剧可能是由于他们的环境发生了变化，例如教育压力加大。

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