biostudies-literatureUnknown58Guan H<h4>Objective</h4>To examine the association between weekday sleep duration and visual health among adolescents in low-resource rural settings, and to explore potential behavioral mechanisms.<h4>Methods</h4>We used cross-sectional data from 36,139 rural primary and junior high school students in northwestern China (2012, 2019). Visual acuity was assessed via standardized LogMAR tests. To address potential endogeneity in self-reported sleep, we applied two-stage least squares regression with sunset time as an instrumental variable.<h4>Results</h4>Students averaged 8.65 weekday sleep hours, and 58.3 % slept fewer than 9 h-below age-specific recommendations. Instrumental variable estimates indicated that each additional weekday sleep hour reduced the LogMAR score by 0.070 (<i>p</i> < 0.05), iPreventive medicine reports103217https://www.ebi.ac.uk/biostudies/studies/S-EPMC12423698biostudies-literatureSleep duration and adolescent vision outcomes: evidence from rural China.PMC12423698Ding YGuan HChen XZhang LLiu WfalseSleep duration and adolescent vision outcomes: evidence from rural China.<h4>Objective</h4>To examine the association between weekday sleep duration and visual health among adolescents in low-resource rural settings, and to explore potential behavioral mechanisms.<h4>Methods</h4>We used cross-sectional data from 36,139 rural primary and junior high school students in northwestern China (2012, 2019). Visual acuity was assessed via standardized LogMAR tests. To address potential endogeneity in self-reported sleep, we applied two-stage least squares regression with sunset time as an instrumental variable.<h4>Results</h4>Students averaged 8.65 weekday sleep hours, and 58.3 % slept fewer than 9 h-below age-specific recommendations. Instrumental variable estimates indicated that each additional weekday sleep hour reduced the LogMAR score by 0.070 (<i>p</i> < 0.05), i2025-01-01T00:00:00Z2025 Oct2026-06-03T02:28:38.292Z2026-04-23T03:09:59.295ZS-EPMC124236984095094010.1016/j.pmedr.2025.103217