Objective: To investigate the prevalence of dry eye in populations equal or over 20 years old in Jiangning District, Shanghai, China.
Methods: This was a cross-sectional study. From September 2008 to January 2009, 6 small districts including 21,102 people of Jiangning District were randomly selected as survey venues by Department of Ophthalmology in First People's Hospital affiliated to Shanghai Jiaotong University.