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. 2010 Oct 18;7(6):342–353. doi: 10.7150/ijms.7.342

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© Ivyspring International Publisher. This is an open-access article distributed under the terms of the Creative Commons License (http://creativecommons.org/licenses/by-nc-nd/3.0/). Reproduction is permitted for personal, noncommercial use, provided that the article is in whole, unmodified, and properly cited.

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X-axis represents different definition criteria for hyperopia, myopia, and astigmatism. (A) Prevalence of refractive errors by age groups (6-8, 9-12, and 13-15 years old). For the prevalence with the 6-8, 9-12 and 13-15 years old, means with ** were significantly different (P<0.001, chi-square test); and means with * were significantly different (P<0.05, chi-square test). (B) Prevalence of refractive errors by gender. (C) Prevalence of refractive errors by school type (academically challenging schools and regular schools). For the prevalence with the academically challenging schools and regular schools, means with ** were significantly different (P<0.001, chi-square test); and means with * were significantly different (P<0.05, chi-square test).

X-axis represents different definition criteria for hyperopia, myopia, and astigmatism. (A) Prevalence of refractive errors by age groups (6-8, 9-12, and 13-15 years old). For the prevalence with the 6-8, 9-12 and 13-15 years old, means with ** were significantly different (P<0.001, chi-square test); and means with * were significantly different (P<0.05, chi-square test). (B) Prevalence of refractive errors by gender. (C) Prevalence of refractive errors by school type (academically challenging schools and regular schools). For the prevalence with the academically challenging schools and regular schools, means with ** were significantly different (P<0.001, chi-square test); and means with * were significantly different (P<0.05, chi-square test).