Smartwatch-monitored physical activity and myopia in children: a 2-year prospective cohort study.

ABSTRACT:

Background

While outdoor time's protective role against myopia is established, the relationship between physical activity (PA) and myopia development remains unclear. This study aimed to determine the impact of PA on myopia in children.

Methods

In this prospective, school-based cohort study conducted in Shanghai from 2016-2018, children aged 6-9 years from 24 primary schools wore smartwatches for 1 year to record activity intensity and environmental status (indoor/outdoor). Activity load was calculated as a weighted sum of time spent in light (1 ×), moderate (2 ×), and vigorous (3 ×) activities. Myopia shift was measured by 2-year changes in spherical equivalent (SE) and axial length (AL). Limited myopia progression was defined as myopic shift ≤ -0.50 D over 2 years.

Resu

SUBMITTER: Chen D 

PROVIDER: S-EPMC12096555 | biostudies-literature | 2025 May

REPOSITORIES: biostudies-literature