Objective:

To investigate the association between outdoor artificial light at night (ALAN) exposure and the risk of developing myopia in children.

Approach:

• Study Design: Cross-sectional and prospective analyses using data from the Hong Kong Children Eye Study, involving 19,114 children with a mean age of 7.4 years.
• Data Collection: Outdoor ALAN exposure was estimated from satellite data within 500 m of each participant's residence.
• Myopia Definition: Myopia was defined as cycloplegic spherical equivalent refraction of −0.50 diopters or less in either eye.
• Statistical Analysis: Models accounted for various factors including age, sex, body mass index, parental myopia, and environmental exposures.

Key Findings:

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Interpretation:

The relationship between outdoor ALAN and incident myopia was nonlinear, with an inflection point at 93.08 nW/cm²/sr indicating increased risk.

Limitations:

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Conclusion:

Findings should be interpreted cautiously regarding causal inference; further longitudinal studies are needed to clarify potential mechanisms.

Sources:

• Environmental Research