Urban greenspace and visual acuity in schoolchildren: a large prospective cohort study in China

作者：Wen-Wen Bao, Yu Zhao, Payam Dadvand, Nan Jiang, Gongbo Chen, Bo‐Yi Yang, Wenzhong Huang, Xiang Xiao, Jinghong Liang, Yican Chen, Yican Chen, Shan Huang, Xue-ya Pu, Shao-yi Huang, Haotian Lin, Yuming Guo, Guang‐Hui Dong, Yajun Chen, Yajun Chen · 发表于：Environment International · 年份：2024 · DOI：10.1016/j.envint.2024.108423 · 被引用次数：34 · 研究领域：Urban Green Space and Health、Ophthalmology and Visual Impairment Studies、Urban Heat Island Mitigation

BACKGROUND: Greenspace is known to have a positive impact on human health and well-being, but its potential effects on visual acuity have not been extensively studied. OBJECTIVES: Our aim was to examine the relationship between long-term greenspace exposure and visual acuity in children, while also exploring the potential mechanisms in this association. METHODS: We conducted this prospective cohort study based on the Children's growth environment, lifestyle, physical, and mental health development project (COHERENCE), which screened 286,801 schoolchildren in Guangzhou, China, starting in the 2016/17 academic year and followed them up for three academic years (2017/18-2019/20). Visual acuity was measured using a standardized logarithmic chart, and visual impairment was defined as visual acuity worse than 0.0 logarithm of the minimum angle of resolution (LogMAR) units in the better eye. We used the Normalized Difference Vegetation Index (NDVI), the Soil-Adjusted Vegetation Index (SAVI), and the Enhanced Vegetation Index (EVI) to assess the greenspace surrounding child's geocoded home and school at each visit. RESULTS: was associated with a 7% decrease [hazard ratios (HRs): 0.93, 95% confidence interval (CI): 0.92, 0.94] in the risk of visual impairment. We also found that air pollution, physical activity, outdoor time, and recreational screen time partially mediated the greenspace-visual acuity association. CONCLUSION: Our findings suggest that increasing greenspace exposure co...