Prevalence and risk factors for astigmatism in 7 to 19-year-old students in Xinjiang, China: a cross-sectional study.

There was a decreasing trend from 15 to 19 years old (Fig. 1 ).

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With increasing age, the prevalence of with-the-rule astigmatism in 7-15-year-old students showed an increasing trend (24.0−33.7%), while a decreasing trend (29.3%−18.8%) was found in 16-19-year-old students.

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