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Myopia Prevention and Outdoor Light Intensity in a School-Based Cluster Randomized Trial
Pei-Chang Wu1, Chueh-Tan Chen1, Ken-Kuo Lin2
1Department of Ophthalmology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.
Ophthalmology
|January 27, 2018
Summary
A school-based program encouraging outdoor activities effectively reduced myopia progression in children. Even moderate light exposure outdoors, like in hallways or under trees, showed protective effects against myopia development.
Area of Science:
- Ophthalmology
- Public Health
- Pediatrics
Background:
- Myopia is a growing public health concern among children worldwide.
- School-based interventions are crucial for implementing preventative strategies.
- Understanding the role of outdoor light exposure is key to myopia prevention.
Purpose of the Study:
- To evaluate a school-based program promoting outdoor activities for myopia prevention in Taiwanese schoolchildren.
- To determine the protective light intensities associated with reduced myopia progression.
Main Methods:
- A multi-area, cluster-randomized controlled trial involving 693 first-grade schoolchildren.
- Intervention group encouraged up to 11 hours weekly of outdoor recess.
- Data collected via eye exams, refraction, axial length, light meters, diaries, and questionnaires.
Main Results:
- The intervention group exhibited significantly less myopic shift and axial elongation compared to the control group.
- A 54% lower risk of rapid myopia progression was observed in the intervention group.
- Children spending at least 11 hours weekly outdoors with ≥1000 lux light showed significant benefits.
Conclusions:
- School-based outdoor promotion programs are effective in reducing myopia progression in children.
- Intense sunlight exposure may not be essential; longer durations of lower light intensity outdoor activity are beneficial.
- Interventions promoting time outdoors, even in shaded areas, can aid myopia prevention.
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