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沙眼是由沙眼在原体感染引起的学生中常见的慢性传染性眼病。对青少年的视力和身体健康造成了一定损害。为了解本县学生沙眼患病状况，提高学生自我保健意识，我们于1997年对本县大中小学生进行了沙眼患病状况调查。1对象与方法1．1按照整群抽样原则，选取大学、中学、小学各3?
Trachoma is a chronic infectious eye disease commonly seen in trachoma caused by a trachoma. Caused some damage to the eyesight and physical health of adolescents. In order to understand the prevalence of trachoma in this county and improve students' awareness of self-care, we investigated the prevalence of trachoma in our county in 1997. 1 objects and methods 1.1 in accordance with the principle of cluster sampling, select the university, secondary and primary schools each 3?