Objective To analyze the prevalence of dry eye syndrome( DES) and its risk factors in senior high school students in Shouguang City of Shandong Province,China. Methods In this cross-sectional survey,1 902 senior high school students w ere selected by a random cluster sampling in July 2010 to complete a questionnaire about DES. Risk factors associated w ith DES w ere evaluated w ith a χ2test and logistic regression analysis. Results The prevalence of DES w as 23. 7% and varied w ith the grade( P < 0. 001). I...