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Article Abstract
Objective: To analyze the association between indoor light at night (LAN) exposure with myopia in children and adolescents.
Methods: A cross-sectional survey was conducted in 2023 involving 872 students aged 6-14 years in Beijing, China. Portable photometers continuously measured indoor LAN exposure over four nights. Log-binomial regression explored the association between LAN with myopia. Iso-temporal Substitution Model (ISM) investigated how reallocating exposure durations at different LAN levels affects myopia.
Results: Compared to the overall ≤1 Lx LAN group, the risk of myopia increased during the 1h post-sleep and 2h post-sleep in the (1,10] lx and >30 lx group and during the 4h post-sleep in the >30 lx group. In contrast, myopia risk decreased during the 2h pre-wake in the (10,30] lx group and during the 1h pre-wake in the (10,30] lx and >30 lx group. Replacing bright light with dim light 2h post-sleep, and dim light with bright light 2h pre-wake, may help reduce myopia risk. The associations were more pronounced in girls and the group with ideal healthy lifestyles.
Conclusion: LAN cycle has a dual association with myopia. Promoting healthy LAN environment, with dim light (≤1 lx) post-sleep and soft light (10-30 lx) pre-wake, may contribute to myopia prevention.
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| http://dx.doi.org/10.1016/j.envres.2025.121915 | DOI Listing |
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