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I. G. Morgan, F. Xiang, M. He; The Impact of Severity of Parental Myopia on Myopia in Chinese Children from Guangzhou. Invest. Ophthalmol. Vis. Sci. 2010;51(13):1699.
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In Guangzhou, 78.3% of children become myopic by the age of 15, irrespective of parental myopia, although parental myopia increases the relative risk by 10-20%. Here, we report on the impact of severity of parental myopia.
Cycloplegic refractions were from a population-based sample of 5-15 year-old children from Guangzhou. Parental myopia was assessed with questions for each parent: "Is the child’s father/mother myopic?"(Yes/No/Not sure) and "What is the degree of myopia (right eye)", and classified as mild (less or equal to -0.5D but greater than -3.0D), moderate (less than or equal to -3.0D but greater than -6.0D, and high (less than or equal to -6.0D).
Information was available for 1567 children aged 12-15. Combinations of mild, moderate and high myopia in the parents were rare, so analysis was restricted to children with no myopia in one parent, and no, mild, moderate or high myopia in the other. The prevalence of myopia was 53.5%, 65.1%, 76.3% and 80.6% in children when the severity of myopia in the second parent was no, mild, moderate and high, and the proportions of high myopia were 1.4%, 2.9%, 8.5% and 16.1% in the corresponding groups. The prevalence of high myopia in the parents was 1.5%, while in the 15 year-old children, it was 3.9%. Of the children with high myopia, 42.1% had parents with no myopia.
There was an increased prevalence of myopia with increasing severity of myopia in one parent, and an increased risk of high myopia with one highly myopic parent. However most highly myopic children at the age of 12-15 did not have a highly myopic parent. This suggests that environmental factors contribute to high myopia in Chinese children in Guangzhou, just as they contribute to less severe myopia in children.
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