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A. Yekta, Sr., A. Fotouhi, H. Hashemi, C. Dehghani, H. Ostadimoghaddam, J. Heravian, A. Derakhshan, S. Mehravaran, R. Yekta, M. Khabazkhoob; Prevalence and Risk Factors of Refractive Errors Among Schoolchildren in Shiraz, Iran. Invest. Ophthalmol. Vis. Sci. 2009;50(13):2436.
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© ARVO (1962-2015); The Authors (2016-present)
To determine the prevalence and risk factors of refractive errors among schoolchildren in Shiraz, Iran.
In a cross-sectional study, using random cluster sampling, 3065 Shiraz schoolchildren were selected in this study. The participants totaled 2683; 1872 elementary and middle school and 811 high school students. For the primary and middle schoolchildren, cycloplegic refraction and for the high school students, non-cycloplegic autorefraction was measured. Myopia, defined as spherical equivalent (SE) refraction -0.50 diopter (D) or worse, hyperopia as SE +2.00D and +0.50D or more for cycloplegic and noncycloplegic refractions respectively, and astigmatism as cylinder -0.75D or worse.
The prevalence of refractive errors in elementary and middle school students was: myopia 4.35 % (95% confidence interval (CI), 2.89 -5.81), hyperopia 5.04 % (95%CI, 3.49 -6.58) and astigmatism 11.79 % (95%CI, 10.21 -13.38). For high school students, these rates were 22.4 % (95%CI, 18.44 -26.36), 10.52 % (95%CI, 6.75 -14.29) and 20.99% (95%CI, 16.55 -25.44), respectively.The prevalence of myopia increased with age in primary and middle school students (OR=1.15, 95% CI, 0.98 to1.33, p=0.073).
The result of this study indicated a relatively low prevalence of refractive errors among schoolchildren in Shiraz according to the protocol by "Refractive Error Study in Children" (RESC) in other investigations.
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