Prevalence of strabismus among preschool children in eastern China and comparison at a 5-year interval: a population-based cross-sectional study.

Objective To update data on strabismus and evaluate the changes in prevalence and patterns among preschoolers in eastern China over a period of 5 years. Design Nanjing Eye Study, a longitudinal population-based study. Setting Recruitment and testing in kindergartens in Yuhuatai District, Nanjing. Participants 2300 eligible children. Main outcome measures Comprehensive ocular examinations were conducted in 1986 children aged 48- Results The overall prevalence rate of strabismus in NES was 5.56% (95% CI 4.54% to 6.57%), which was not significantly different from that in NPVP (4.99%, 95% CI 4.13% to 5.84%, p=0.40). The prevalence of subtypes of strabismus underwent significant changes, with significant increase in intermittent exotropia (IXT) in NES (2.78% vs 4.69%, p=0.001) and significant decrease in constant exotropia (1.17% vs 0.15%, p Conclusion The prevalence of strabismus appeared stable in children aged 48-