Secondhand smoke (SHS) exposure is associated with an increased risk of developing myopia among nonmyopic children in China.

Purpose: To investigate the impact of secondhand smoke (SHS) exposure on myopia prevalence and risk among nonmyopic children in China.

Methods: This was a retrospective cohort study. A total of 232 children aged 5-10 years were included, with 128 exposed to SHS and 104 who were not.