Increases in the prevalence of reduced visual acuity and myopia in Chinese children in Guangzhou over the past 20 years
- Xiang, F
- He, M
- Zeng, Y
- Mai, J
- Rose, KA
- Morgan, IG
DOIAbstract
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 annually, using a LogMAR tumbling E chart. VA is reported as Snellen categories: normal (VA≥6/6), mildly reduced (6/9<VA<6/6), moderately reduced (6/18<VA≤6/9), and severely reduced VA (VA≤6/18). Results: In 1988, over 80% of children in Grade 1 (age 6 years) and about 30% in Grade 12 (age 17 years) had normal unaided VA. By 2007, this dropped to only 60% in Grade 1 and about 10% in Grade 12. Conversely, the prevalence of moderately and severely reduced unaided VA increased from 6.2% in Grade ...
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