Wavelength effects and chromatic light intervention on axial length

This ORKG comparison summarizes primary research examining the effects of light wavelength and chromatic light interventions on axial length in myopia. Clinical studies of repeated low-level red-light (RLRL) therapy, which uses long-wavelength light exposures of defined duration and intensity, have reported slower axial elongation and reduced refractive progression in children compared with controls over follow-up periods of up to 12 months. Long-wavelength red light demonstrates a stronger inhibitory effect on axial elongation and myopia progression than short-wavelength (blue/violet) exposures, while short-term narrowband exposure effects are variable. These differences in light wavelength, exposure duration, and study design contribute to mixed findings, underscoring the need for standardized longitudinal assessments of spectral interventions on ocular growth.