A study involving normal participants found no observed difference in sleep quality .
We found no studies investigating effects on macular structure or function .
We find a lack of high quality evidence to support using BB spectacle lenses for the general population to improve visual performance or sleep quality , alleviate eye fatigue or conserve macular health
PURPOSE Blue-blocking ( BB ) spectacle lenses , which attenuate short-wavelength light , are being marketed to alleviate eyestrain and discomfort when using digital devices , improve sleep quality and potentially confer protection from retinal phototoxicity .
The aim of this review was to investigate the relative benefits and potential harms of these lenses .
Amber lenses to block blue light and improve sleep: a randomized trial.
All light is not equal : blue wavelengths are the most potent portion of the visible electromagnetic spectrum for circadian regulation . Therefore , blocking blue light could create a form of physiologic darkness . Because the timing and quantity of light and darkness both affect sleep , evening use of amber lenses to block blue light might affect sleep quality . Mood is also affected by light and sleep ; therefore , mood might be affected by blue light blockade . In this study , 20 adult volunteers were r and omized to wear either blue-blocking ( amber ) or yellow-tinted ( blocking ultraviolet only ) safety glasses for 3 h prior to sleep . Participants completed sleep diaries during a one-week baseline assessment and two weeks ' use of glasses . Outcome measures were subjective : change in overall sleep quality and positive/negative affect . Results demonstrated that sleep quality at study outset was poorer in the amber lens than the control group . Two- by three-way ANOVA revealed significant ( p < .001 ) interaction between quality of sleep over the three weeks and experimental condition . At the end of the study , the amber lens group experienced significant ( p < .001 ) improvement in sleep quality relative to the control group and positive affect ( p = .005 ) . Mood also improved significantly relative to controls . A replication with more detailed data on the subjects ' circadian baseline and objective outcome measures is warranted
A study involving normal participants found no observed difference in sleep quality .
We found no studies investigating effects on macular structure or function .
We find a lack of high quality evidence to support using BB spectacle lenses for the general population to improve visual performance or sleep quality , alleviate eye fatigue or conserve macular health
PURPOSE Blue-blocking ( BB ) spectacle lenses , which attenuate short-wavelength light , are being marketed to alleviate eyestrain and discomfort when using digital devices , improve sleep quality and potentially confer protection from retinal phototoxicity .
The aim of this review was to investigate the relative benefits and potential harms of these lenses .