方法：采用分层、随机抽样的方法，以海南省主要黎苗族地区， 5 353例城乡居民为调查对象，对调查者进行眼部检查，并进行泪道冲洗，然后填写泪道阻塞调查表。分析海南省主要黎苗族地区泪道阻塞患病率及人群分布特点。

结果：海南省主要黎苗族地区泪道阻塞患病率为4.47%，城市和农村的患病率分别为2.62%及5.93%。男女两组患病率分别为1.69%及6.39%，差异有统计学意义(χ²=67.2821，P=0.0000)。40～69岁年龄段发病率最高，70～79岁次之，好发女性。乐东县、陵水县、白沙县、昌江县患病率高于保亭县、琼中县、五指山市。左右眼别患病率比较，无差异。

结论：海南省主要黎苗族地区泪道阻塞患者群主要为40～79岁年龄段，好发于女性。城乡之间患病率比较，差异有统计学意义； 其患病率较高与年龄、性别、地理位置、气候条件、卫生环境等有关； 同时干燥多风的地区患病率高于湿润少风的地区。

METHODS: Totally 5 353 residents were selected and researched by randomized cluster sampling in the major Li Miao minority areas of Hainan province. Ocular examination and lachrymal duct flushing were carried out, and questionnaire survey on lachrymal duct obstruction was conducted. The ratio of lachrymal duct obstruction diseases and group distribution characteristics were analyzed based on above research.

RESULTS: The prevalence ratios of lachrymal duct obstruction was 4.47% in major Li Miao minority areas of Hainan province, with 2.62% in urban area, and 5.93% in rural area respectively. Prevalence ratios of men and women group were 1.69% and 6.39% correspondingly. Difference between the two groups was statistically significant(χ²=67.2821, P=0.0000). The highest prevalence ratio was 40-69 year-old group, second one was 70-79 year-old group, especially for women in these groups. The prevalence ratios of Ledong, Lingshui, Baisha and Changjiang county were higher than those of Baoting, Qiongzhong county and Wuzhishan city. No significant difference was found between both eyes.

CONCLUSION: In major Li Miao minority areas of Hainan province, lachrymal duct obstruction mainly occurs in 40-79 year-old patients, with specially higher ratio of women. Statistically, significant difference of the prevalence ratio between urban and rural areas exists. The higher prevalence ratio is attributed to age, gender, geographical location, climate condition, health environment and so on. The prevalence ratio is higher in the dry and windy areas than in the humid and less windy areas.