Increases in the prevalence of reduced visual acuity and myopia in Chinese children in Guangzhou over the past 20 years
Background/aims: To estimate the prevalence of myopia based on reduced unaided visual acuity (VA) in Chinese school children over the past 20 years. Methods: Guangzhou school health authorities have measured VA on Grade 1-12 students from 1988 to 2007 ann
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