A Serial Cross-Sectional Analysis of the Prevalence, Risk Factors and Geographic Variations of Reduced Visual Acuity in Primary and Secondary Students from 2000 to 2017 in Hong Kong.

School Type and Grade of Students Relative to primary school, studying in secondary school had a higher risk for reduced VA with a decreasing trend of ORs from 2.898 (95% CI, 2.875−2.920) to 2.696 (95% CI, 2.676−2.716) before adjusting for age and sex, and a decreasing trend of ORs from 1.106 (95% CI, 1.094−1.119) to 0.707 (95% CI, 0.699−0.716) after adjustment from 2000/2001−2003/2004 to 2013/2014−2016/2017.

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Senior students had a higher risk for reduced VA with an increasing trend before adjusting for age and sex, and a decreasing trend after adjustment from 2000/2001−2003/2004 to 2013/2014−2016/2017.

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