方法：选取2014-01/10对东莞市塘厦镇10间工厂的务工人员进行系统抽样，所有受检人均被要求完成VDT问卷调查、调节幅度测定、泪膜破裂时间测定、角膜荧光素染色、泪液分泌功能测定等检查，结果运用SPSS19.0统计软件分析处理。

结果：入组469例，其中男246例，女223例，诊断为视屏终端综合征384例，其中男206例，女178例，患病率为81.9%。40～<50岁组和50～<60岁组人群中不同性别VDT综合征患者患病率差异比较有统计学意义，其余年龄段组别不同性别VDT综合征患者患病率差异比较无统计学意义。VDT综合征患者认为观看视频是智能手机最重要的用途，首选者占181例(43.1%)； 非VDT综合征患者认为微信、QQ等社交通讯为智能手机最重要用途，首选者占33例(38.8%)。VDT综合征患者的视疲劳发生率为83.9%(322/384)，其中196例(60.9%)出现调节幅度下降。267例VDT综合征患者出现干眼症，发生率为69.5%。卧床观看智能手机这一习惯，对VDT综合征患者与非VDT综合征患者来说差异无统计学意义。而小说阅读、观看视频、昏暗及摇晃空间中观看手机、日常运动量、观看中的休息间隙的差异均有显著统计学意义。日常运动和休息间隔为VDT综合征患病的保护因素，其他4者均为VDT综合征患病的危险因素。

结论：影响务工人员VDT综合征发病的主要因素是使用手机阅读小说、观看视频、环境昏暗、空间摇晃、休息间隙不足和日常运动量少。改掉不良的智能手机使用习惯、多做运动、增加休息间隙、滋润眼表有望能防治VDT综合征。

METHODS: From January to October 2014, migrant workers who worked in 10 factories individually in Tangxia Town Dongguan City, were selected by systematic sampling. Every participant was asked to complete the visual display terminal questionnaire and acepted accommodative amplitude determination, tear-film break up time, corneal fluorescein staining, Schirmer I text and so on. The data was analyzed by the SPSS 19.0 software.

RESULTS: Four hundred and sixty-nine people were enrolled(246 males, 223 females). Among them, 384 cases(206 males and 178 females)were diagnosed as the VDT syndrome, the prevalence rate was 81.9%. Compared the prevalence rate in different gender in 40～<50 groups and 50～<60 group, the differences were statistically significant. The difference of gender was not statistically significant in the other age groups. Patients with VDT syndrome considered that watching the video was the most important use of smartphones, preferred accounted in 181 people(43.1%). People without VDT syndrome thought that communicating through WeChat, QQ and some other chat tools was the most important usage, preferred accounted in 33 people(38.8%). The prevalence of visual fatigue in patients with VDT syndrome was 83.9%(322/384). One hundred and ninety-six patients(60.9%)had accommodative amplitude reduction. The 267 patients(69.5%)with VDT syndrome were identified with dry eye. The difference of watching smartphones in bed between people with or without VDT syndrome was not statistically significant. While on reading novels, watching videos, being in dark and shaking space, having daily sport, getting interval in using, the differences were statistically significant. Daily sport and interval were the protective factors for VDT syndrome, the others were risk factors for VDT syndrome.

CONCLUSION:The main factors for VDT syndrome in the migrant workers are reading novels, watching videos, being in dark and shaking space, poor sport and less interval. To get rid of the bad habits in using smartphones, do more sport, take more intervals, moisten the ocular surface are expected to prevent VDT syndrome.