Blue Light Defocus Induces A Positive Effect on Refractive Status and Ocular Health: A Randomized Crossover Trial.

ABSTRACT: This randomized crossover trial investigates the effects of blue light defocus display technology on refractive status, axial length (AL), retinal blood flow, and visual function in adults. Twenty-one participants completed all four interventions: 0D, 1D, 2D defocus, and 1D defocus with 30 % blue light filtering (1D+BLF) in a randomized order during standardized visual tasks. Pre- and post-task assessments include refraction, AL, choroidal thickness (ChT), retinal defocus, reading efficiency, and visual fatigue. Results demonstrate that 1D defocus reduces spherical equivalent refraction (SER) (-4.35 ± 2.66 D to -4.21 ± 2.66 D, P = 0.045) and increases ChT (P = 0.003), while 1D+BLF induces axial elongation (P = 0.026). Both 1D and 2D defocus are linked to increased ChT,

SUBMITTER: Wu J 

PROVIDER: S-EPMC12697078 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature