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October 9, 2025British Journal of OphthalmologyOpen Access

Time outdoors prevents myopia in hyperopic children, but protection is weaker in premyopic children: a post-hoc analysis of a cluster-randomised trial

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Authors

JCJun ChenZQZiyi QiIMIan G. Morgan

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Overview

Post-hoc analysis reveals that time outdoors limits myopic shift in hyperopic children, suggesting minimal effects for premyopic children.

Key Points

  • Increased outdoor time had a modest effect on myopic shift in premyopic children, indicating limited effectiveness.
  • Among 3194 participants, the significant myopic shift was seen only with time outdoors exceeding 120 minutes daily.
  • The study employed a cluster-randomised trial design to evaluate outdoor time effects on myopia development in children.
  • Further strategies or longer outdoor durations may be necessary to effectively combat myopia onset in premyopic children.

Cite This Study

Chen et al. (2025) studied this question.

synapsesocial.com/papers/68e77f09d1c187e1c108fb45https://doi.org/10.1136/bjo-2025-327768
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