Dual associations of post-sleep and pre-wake light-at-night (LAN) exposure with myopia in children and adolescents

The risk of myopia increased during specific nighttime light exposure periods in children aged 6-14 years.

• Increased myopia risk was observed during the 1 hour and 2 hours after sleep in children exposed to light levels between 1 and 10 lux, and also in those exposed to light levels greater than 30 lux.
• Myopia risk decreased during the 2 hours before waking in children exposed to light levels between 10 and 30 lux.
• Replacing bright light with dim light 2 hours after sleep, and vice versa 2 hours before waking, may reduce myopia risk.
• The associations between light exposure and myopia were more pronounced in girls and those with healthier lifestyles.
• The findings suggest a dual association of indoor light at night with myopia in children.

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