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 .
VISION WITH CHROMATIC FILTERS*
& NA ; Detection and resolution thresholds for blue and yellow targets against blue , green , and yellow background s were measured while wearing yellow and blue filters . Yellow filters improved thresholds for yellow targets against blue background s. Their effectiveness decreased ( i ) as the wavelength of the background increased , ( ii ) as the size of the target decreased , and ( iii ) with the age of the observer . The blue filters were generally ineffective . The results are for the most part explained on the basis of changes in target contrast brought about by the filters . The effectiveness of  yellow facemasks  for divers under certain conditions is discussed
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 .