The global prevalence of dry eye disease and its association with economy: a systematic review
Abstract Objective To investigate the relationship between the economy and the prevalence of dry eye disease (DED) worldwide. Methods Literature search on PubMed, Cochrane and Embase database was conducted to identify eligible records published from January 2008 to December 2018. Gross domestic product (GDP) per capita and gross national income (GNI) per capita was chosen to evaluate national economic status. Pearson coefficient, linear regression, and t test were performed in the statistical analyses. Results 32 population-based surveys conducted in 17 countries were included, with a total of 184255 subjects. The pooled mean prevalence of DED was 14.6%, and female individuals presented a higher prevalence than males (16.8% versus 11.5%, 𝑃 < 0.001). The prevalence of DED was negatively correlated with GNI per capita (𝑃 < 0.001, r = 0.603) and GDP per capita (𝑃 < 0.001, r = 0.600). Grouped by World Bank Income classifications, the prevalence of DED progressively declined with an increase in economic level from lower-middle-income countries (LMICs) to high-income countries (HICs). Remarkable difference was found between the prevalence of DED in LMICs and that in HICs (𝑃 < 0.001). Conclusions This study suggested a correlation between the economy and the prevalence of DED worldwide. These findings may provide valuable information on the global prevalence of DED from a distinctive epidemiologic perspective.