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Comment & Response |

School-Based Myopia Prevention Effort

Chen-Wei Pan, MD, PhD1; Hu Liu, MD, PhD2
[+] Author Affiliations
1School of Public Health, Medical College of Soochow University, Suzhou, China
2Department of Ophthalmology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
JAMA. 2016;315(8):819. doi:10.1001/jama.2015.17133.
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To the Editor The school-based myopia prevention trial conducted by Dr He and colleagues1 supports what has been noted in observational studies2 that more time spent outdoors reduces the risk of myopia in children. However, one important issue regarding this finding has not been fully addressed by the authors.

Longitudinal cohort studies have indicated that more time spent outdoors has a significant protective effect on myopia onset, but not its progression.3,4 In other words, spending more time outdoors is only effective in children without myopia, but not in children with existing myopia.


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February 23, 2016
Mingguang He, MD, PhD; Ian G. Morgan, PhD
1Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
JAMA. 2016;315(8):820. doi:10.1001/jama.2015.17150.
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