No abstract available
MeSH terms
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Child
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Child, Preschool
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China / epidemiology
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Eye Diseases, Hereditary / epidemiology
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Health Surveys
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Humans
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Persons with Visual Disabilities / statistics & numerical data*
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Prevalence
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Refractive Errors / epidemiology
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Rural Population / statistics & numerical data
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Urban Population / statistics & numerical data
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Vision Tests
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Vision, Low / epidemiology*
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Visual Acuity