Summary
This large retrospective study of 4422 Chinese children found that outdoor activity, screen time, sleep duration, and ocular alignment all influence axial length — a key marker of myopia progression. Lighting and lifestyle interventions promoting outdoor time (15–21 hours/week) and adequate weekday sleep may help reduce axial elongation and myopia risk in children.
Key Findings
- Children with 15–21 hours of outdoor activity per week were significantly more likely to have shorter axial length or AL/CR ratio (p = 0.017)
- More than 14 hours of total weekly media exposure was associated with shorter AL/CR ratio (p = 0.033), suggesting possible compensatory effects or confounding
- Shorter weekday sleep duration was positively associated with interocular axial length difference (p = 0.009), indicating asymmetric eye growth
- Longer weekend sleep duration was also associated with greater interocular AL/CR difference (p = 0.033)
- Esotropia was associated with shorter axial length in preschoolers (p = 0.014, 0.029) and greater interocular difference in primary school children (p = 0.001)
- Axial length and interocular differences were primarily determined by age across the sample of 4422 children
Categories
Eye Health & Vision: Study investigates axial length distribution and myopia-related factors in 4422 Chinese children, including sleep duration as a correlating variable.
Student Learning: Research covers children and teenagers across age groups, examining lifestyle factors like outdoor activity, screen time, and sleep that influence ocular development.
Author(s)
X Mao, M Chen, X Sun, J Dai
Publication Year
2022
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