Hypopsia surveillance in primary and middle school students in Zhejiang, 2017

Objective To understand the epidemiological characteristics of hypopsia in primary and middle school students in Zhejiang province, and provide scientific evidence for the prevention and control of hypopsia.

Methods Using stratified cluster sampling method, the eyesight of primary and middle school students in areas with different economic levels, urban and suburban areas of Zhejiang province was surveyed. GB/T 26343－2010 was used to detect the visual acuity of the naked eye. hypopsia was defined as baked eye vision ＜5.0. Software SPSS 17.0 was used for statistical analysis, χ² test was done for rate comparison and Goodman-Kruskal Gamma test was conducted for correlation analysis.

Results A total of 8 343 primary and middle school students in Zhejiang were surveyed, the hypopsia rate was 73.53% and severe hypopsia rate was 47.03%. The primary school students, junior high school students and senior high school students with hypopsia accounted for 55.99%, 81.51% and 86.73%, the differences were statistically significant （χ²＝783.526, P＜0.001）. The hypopsia prevalence was higher in urban students, or in girls. Students with better economic conditions had the higher prevalence of hypopsia （χ²＝80.206, P＜0.001）.

Conclusion The eyesight level of primary and middle school students in Zhejiang is much lower than national level. It is necessary to strengthen the prevention and control of hypopsia in students, the key populations are high grade students of primary schools and students of junior high school, especially girls as well as the boys in grade 9–10, who are prepared to enter a higher school.