Blue-Light-Blocking Glasses

Blue-light-blocking glasses filter part of the short-wavelength light emitted by screens and LED lighting, sold for eye strain and — in amber-tinted evening versions — for sleep.

What published research reports

A 2023 Cochrane systematic review of 17 randomised trials reported that blue-light-filtering spectacle lenses probably make no difference to eye strain from computer use, found no clear short-term effect on visual performance, and judged the evidence on sleep outcomes inconclusive because trials were small, short and inconsistent. Separately, the circadian literature — including the Somnologie review of light and sleep — documents that evening light exposure delays melatonin release, which is the mechanism the sleep marketing rests on; whether filtering glasses meaningfully change that in real use is what remains unproven in the trial data.

References

• Singh S, et al. Blue-light filtering spectacle lenses for visual performance, sleep, and macular health in adults. Cochrane Database Syst Rev. 2023. PubMed
• Blume C, et al. Effects of light on human circadian rhythms, sleep and mood. Somnologie. 2019. PubMed