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 .
Effect of Blue Light–Reducing Eye Glasses on Critical Flicker Frequency
Purpose This study aims to evaluate the effect of blocking short-wavelength light on critical flicker frequency ( CFF ) . Design This study is a prospect i ve clinical study . Methods Thirty-three participants ( 17 men and 16 women ; age range , 28–39 years ) were divided into 3 groups . Each group wore 1 of 3 types of lenses while performing an intensive computer task for 2 hours . To evaluate the effect of blocking short-wavelength light before and after the task , we measured the CFF and evaluated subjective question naires . We used the analysis of variance test to examine whether the type of lenses tested affected any of the visual fatigue-related parameters . Results The type of lens worn significantly affected the CFF ; however , answers to the subjective question naires did not differ significantly between the groups . Two of the 13 question items showed a statistical difference between lens transparency and increase in the CFF ( lens 3 > lens 2 > lens 1 ) . Conclusions The higher the blocking effect of the lens , the lower the reduction in the CFF , suggesting that blocking short-wavelength light can reduce eye fatigue
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 .