Short-Term Exposure to Violet Light Emitted from Eyeglass Frames in Myopic Children: A Randomized Pilot Clinical Trial

Hidemasa Torii, Kiwako Mori, Takashi Okano, Shinichiro Kondo, Hao Yung Yang, Erisa Yotsukura, Akiko Hanyuda, Mamoru Ogawa, Kazuno Negishi, Toshihide Kurihara, Kazuo Tsubota

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Violet light (VL), 360–400 nm wavelength, is contained in the sunlight and is an effective element for myopia suppression. This study is to investigate the safety and efficacy of novel eyeglasses that emit VL from the frames. This is a double-masked, randomized, pilot clinical trial conducted in a clinic in Japan. Forty-three children with myopia were enrolled. Participants were randomly assigned to two groups, wearing VL-emitting eyeglass frames (VLf) that emitted VL of 310 μW/cm2 (VLf group, n = 22) or pseudo-placebo eyeglass frames with a minimal emission of VL (<10 μW/cm2) (control group, n = 21). The exposure time was 3 h per day. The primary outcomes were visual acuity, tear film break-up time, corneal endothelial cell density, and the slit-lamp/fundus examinations. The secondary outcome was the 6-month changes in the axial lengths and cycloplegic refractions. Forty-one (95%) participants were included; twenty-one in the VLf group and twenty in the control group. No significant differences were seen in any safety evaluation. Significant changes were seen in axial elongation, choroidal thickness, and cycloplegic refractions in the subgroup analysis of 8- to 10-year-old children (p < 0.05), but otherwise no significant differences were seen. The VLf showed short-term safety and effectiveness against myopia progression.

Original languageEnglish
Article number6000
JournalJournal of Clinical Medicine
Issue number20
Publication statusPublished - 2022 Oct


  • efficacy
  • myopia
  • randomized double-blind placebo-controlled clinical trial
  • safety
  • violet light

ASJC Scopus subject areas

  • General Medicine


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