Objective Monitoring of Tablet Use–Related Optical Exposure and Its Association With Axial Length in Preschool Children: Cross-Sectional Intelligent Monitoring Study

Key Points

• Shorter axial length is linked to higher ambient illuminance during tablet use, indicating a protective effect.
• Screen brightness has a nonlinear correlation with axial elongation, suggesting careful monitoring is needed.
• The observational analysis emphasizes the role of environmental lighting and device settings in visual health outcomes.
• These findings support the development of guidelines aimed at optimizing safe digital device use for preschoolers.

Abstract