Repeated red-light therapy temporarily affects color vision but shows no lasting impact

Repeated low-level red-light (RLRL) therapy causes a temporary reduction in color vision sensitivity that resolves within 5 minutes, with no lasting impact on vision or eye structure, according to a study.

Researchers evaluated 20 participants using color vision and retinal imaging tests before and after 3 RLRL sessions. Each session caused a brief decrease in color perception that returned to normal within 5 minutes. No significant long-term changes in color vision or choroidal thickness were observed, aside from a minor reduction in the right eye’s choroidal thickness.

Participants responded positively to the therapy.

Reference
Batool B, Davey C, Dahlmann-Noor A, et al. Evaluation of Short-Term Color Vision Perception Changes After Using a Repeated Low-Level Red-Light Therapy Myopia Management Device. Curr Eye Res. 2025;1-8. doi: 10.1080/02713683.2025.2523912. Epub ahead of print. PMID: 40619127.