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Focusing of Light in the Eye01:16

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

Jinfang Wu1, Ze-Hua Xu1, Yuanyuan Miao1

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Blue light defocus display technology shows promise in managing myopia. Interventions like 1D defocus reduced refractive error and improved reading, while blue light filtering influenced axial length, suggesting potential for visual health.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Visual Science

Background:

  • Myopia prevalence is increasing globally.
  • Defocus, particularly hyperopic defocus, is a key factor in myopia progression.
  • Blue light's role in visual function and potential impact on eye growth is under investigation.

Purpose of the Study:

  • To investigate the effects of blue light defocus display technology on refractive status, axial length, retinal blood flow, and visual function in adults.
  • To evaluate different levels of defocus (0D, 1D, 2D) and blue light filtering (1D+BLF) during standardized visual tasks.

Main Methods:

  • A randomized crossover trial involving 21 adult participants.
  • Four interventions: 0D, 1D, 2D defocus, and 1D defocus with 30% blue light filtering (1D+BLF).
  • Pre- and post-task assessments included refraction, axial length, choroidal thickness, retinal defocus, reading efficiency, and visual fatigue.

Main Results:

  • 1D defocus reduced spherical equivalent refraction and increased choroidal thickness.
  • 1D+BLF intervention induced axial elongation.
  • Both 1D and 2D defocus increased choroidal thickness; 0D and 1D+BLF showed hyperopic defocus trends.
  • Reading speed and efficiency improved with 1D defocus.
  • Visual fatigue and blink frequency increased significantly in the 0D group.

Conclusions:

  • Blue light defocus technology may help mitigate hyperopic defocus and influence retinal perfusion.
  • The technology shows potential in alleviating visual fatigue and may play a role in myopia prevention.
  • Further research in diverse populations and long-term studies are needed to validate these findings.