Biological effects of high-energy visible light

For comparison, UV-A at 380  nm (V(λ)=0.000 039) requires 25 641 times the amount of radiometric energy to be perceived at the same intensity as green, three orders of magnitude greater than blue LEDs.

[12] However, the CIE published its position on the low risk of blue-light hazard resulting from the use of LED technology in general lighting bulbs in April 2019.

Harvard Health Publishing asserts that exposure to blue light at night has a strong negative effect on sleep.

[citation needed] Blue light has been implicated as the cause of digital eye strain, but there is no robust evidence to support this hypothesis.

Apple's and Microsoft's operating systems and even the preset settings of standalone computer monitors include options to reduce blue-light emissions by adjusting color temperature to a warmer gamut.

The IOL may be designed to filter out equal, more or less UV light than the natural lens (have a higher or lower cutoff), and therefore attenuate or accentuate the blue-light hazard function.

[27] However, it has been argued that IOLs that remove more blue light than natural lenses negatively affect color vision and the circadian rhythm while not offering significant photoprotection.

[30] One study claimed a large difference in observed fluorescein angiography examinations and observed markedly less "progression of abnormal fundus autofluorescence";[31] however the authors failed to discuss the fact that the excitation beam is filtered light between 465 and 490 nm,[32] is largely blocked by blue light filtering IOLs[33] but not clear IOLs present in the control patients.

[40] The UK's General Optical Council has criticised Boots Opticians for their unsubstantiated claims regarding their line of blue-light filtering lenses; and the Advertising Standards Authority fined them £40,000.

[41] Trevor Warburton, speaking on behalf of the UK Association of Optometrists stated: "...current evidence does not support making claims that they prevent eye disease.".

[42] In July 2022, a Gamer Advantage advert on Twitch channel BobDuckNWeave was banned by the Advertising Standards Authority for making claims that blue light glasses could improve sleep without substantiation.