Fig. 2From: Prevalence and risk factors for astigmatism in 7 to 19-year-old students in Xinjiang, China: a cross-sectional studyPrevalence rates of astigmatism (≥ 0.75 D and ≥ 1.5 D) and high astigmatism (≥ 3.0 D) by the magnitude of spherical equivalentBack to article page