Association between insufficient sleep and astigmatism in preschool children. - Zhao, Xixuan; Peng, Yajun; Yu, Tao; Lin, Senlin; Chen, Hao; Qian, Dan; Zhu, Jianfeng; Jia, Yingnan; Zou, Haidong; Ma, Yingyan (European Journal of Pediatrics, 2025)