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Prevalence of refractive errors according to age
Myopia was defined as spherical equivalents of worse than -0.75 diopter. Hyperopia was defined defined as spherical equivalents of worse than +1.0 diopter. Astigmatism was defined as a cylindrical error worse than +0.75 diopter.
No = number of participants; Prev = prevalence; SE = standard error.
