The Impact of Severity of Parental Myopia on Myopia in Chinese Children.
Source
State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat Sen University, Guangzhou, Guangdong, PR China (FX, MH), and Research School of Biology, College of Medicine, Biology and the Environment, Australian National University, Canberra, Australian Capital Territory, Australia (FX, IGM).
Optom Vis Sci. 2012
This study looked at the prevalence of myopia among 12-15 year olds in relationship to the level of myopia in their parents, in China. The children had one parent who was not myopic and one who either did not have myopia, or had mild, moderate or high myopia. The researchers found that,60-80% of the children who had a parent with mild, moderate of high myopia, also had myopia (the greater percentage was among the children whose parents had high myopia). Interestingly though, 50% of myopic children had two non-myopic parents, and of the children with high myopia, 45.3% also had two non-myopic parents. That seems fairly high for not having a genetic predisposition.
From the abstract:
"CONCLUSIONS.: More severe myopia in one parent results in an increased risk of myopia in the children. However, most highly myopic children did not have a highly myopic parent and also half did not have any reported parental myopia. This suggests that while genetic factors contribute to the development of more severe myopia, environmental factors also contribute to high myopia in children in Guangzhou."
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