Blue Light Blocking Lenses Measuring Device

Chen, Der‐Chin; Huang, Kuang-Lung; Lee, Siak-Lim; Wang, Jui-To

doi:10.1016/j.proeng.2015.10.150

Cited by 6 publications

(7 citation statements)

References 12 publications

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“…A viable solution to protect ocular tissues and control exposure is to filter blue light through the use of BBLs. For many years, a large number of BBLs have been designed in different colours (red, green, blue, orange, pink, brown, and yellow) . However, yellow lenses have been shown to provide the most protective effect because they absorbed almost all blue wavelengths of light and can provide efficient protection to retinal cells from damage …”

mentioning

confidence: 99%

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Modelling the effect of commercially available blue‐blocking lenses on visual and non‐visual functions

Alzahrani

Khuu

Roy

2020

Clinical and Experimental Optometry

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Background: Blue-blocking lenses (BBLs) are marketed as providing retinal protection from acute and cumulative exposure to blue light over time. The selective reduction in visible wavelengths transmitted through BBLs is known to influence the photosensitivity of retinal photoreceptors, which affects both visual and non-visual functions. This study measured the spectral transmittance of BBLs and evaluated their effect on blue perception, scotopic vision, circadian rhythm, and protection from photochemical retinal damage. Methods: Seven different types of BBLs from six manufacturers and untinted control lenses with three different powers (+2.00 D, −2.00 D and Plano) were evaluated. The whiteness index of BBLs used in this study was calculated using Commission International de l'Eclairage (CIE) Standard Illuminates D65, and CIE 1964 Standard with a 2 Observer. The protective qualities of BBLs and their effect on blue perception, scotopic vision, and circadian rhythm were evaluated based on their spectral transmittance, which was measured with a Cary 5,000 UV-Vis-NIR spectrophotometer. Results: BBLs were found to reduce blue light (400-500 nm) by 6-43 per cent, providing significant protection from photochemical retinal damage compared to control lenses (p ≤ 0.05). All BBLs were capable of reducing the perception of blue colours, scotopic sensitivities and circadian sensitivities by 5-36 per cent, 5-24 per cent, and 4-27 per cent, respectively depending on the brand and power of the lens. Conclusion: BBLs can provide some protection to the human eye from photochemical retinal damage by reducing a portion of blue light that may affect visual and non-visual performances, such as those critical to scotopic vision, blue perception, and circadian rhythm.

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confidence: 99%

“…Wearing BBLs in daytime hours is known to increase sleepiness and might be dangerous for night time driving . This is because BBLs block wavelengths that are required for scotopic vision, alertness and cognitive performance, and interfere with colour perception …”

mentioning

confidence: 99%

Modelling the effect of commercially available blue‐blocking lenses on visual and non‐visual functions

Alzahrani

Khuu

Roy

2020

Clinical and Experimental Optometry

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“…The shorter blue-violet wavelengths within this range (380−455 nm) are sometimes referred to as high energy visible (HEV) radiation [1,2]. At the terrestrial surface, the action spectrum for blue light hazard peaks at approximately 440 nm [3,4] and is associated with what is frequently referred as the "blue light hazard". In contrast to blue-violet wavelengths that have higher energy, the green-yellow wavelengths associated with photopic vision have lower energy as the photopic action spectrum peaks at about 555 nm.…”

Section: Introductionmentioning

confidence: 99%

“…Intense or long duration of exposure to strong HEV sources is hazardous and could lead to photochemical damage of the retina. This damage is referred to as "photoretinitis" [4,7,[10][11][12][13], also known as "photoretinopathy" [3,11] 3 of 14…”

Section: Introductionmentioning

confidence: 99%

“…Intense or long duration of exposure to strong HEV sources is hazardous and could lead to photochemical damage of the retina. This damage is referred to as “photoretinitis” [ 4 , 7 , 10 , 11 , 12 , 13 ], also known as “photoretinopathy” [ 3 , 11 ] or photomaculopathy [ 5 , 14 , 15 ]. Prolonged exposure to HEV has the potential to contribute to the development of age related macular degeneration (AMD) [ 1 , 2 , 4 , 8 , 12 , 15 ], although this link has not been confirmed and is thus not universally agreed upon [ 5 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

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Solar Blue Light Radiation Enhancement during Mid to Low Solar Elevation Periods under Cloud Affected Skies

Parisi

Igoe

Amar

et al. 2020

Sensors

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Solar blue-violet wavelengths (380−455 nm) are at the high energy end of the visible spectrum; referred to as “high energy visible” (HEV). Both chronic and acute exposure to these wavelengths has been often highlighted as a cause for concern with respect to ocular health. The sun is the source of HEV which reaches the Earth’s surface either directly or after scattering by the atmosphere and clouds. This research has investigated the effect of clouds on HEV for low solar elevation (solar zenith angles between 60° and 80°), simulating time periods when the opportunity for ocular exposure in global populations with office jobs is high during the early morning and late afternoon. The enhancement of “bluing” of the sky due to the influence of clouds was found to increase significantly with the amount of cloud. A method is presented for calculating HEV irradiance at sub-tropical latitudes from the more commonly measured global solar radiation (300–3000 nm) for all cases when clouds do and do not obscure the sun. The method; when applied to global solar radiation data correlates well with measured HEV within the solar zenith angle range 60° and 80° (R2 = 0.82; mean bias error (MBE) = −1.62%, mean absolute bias error (MABE) = 10.3% and root mean square error (RMSE) = 14.6%). The technique can be used to develop repeatable HEV hazard evaluations for human ocular health applications

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Spectral Evaluation of Eyeglass Blocking Efficiency of Ultraviolet/High-energy Visible Blue Light for Ocular Protection

et al. 2019

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Blue Light Blocking Lenses Measuring Device

Cited by 6 publications

References 12 publications

Modelling the effect of commercially available blue‐blocking lenses on visual and non‐visual functions

Modelling the effect of commercially available blue‐blocking lenses on visual and non‐visual functions

Solar Blue Light Radiation Enhancement during Mid to Low Solar Elevation Periods under Cloud Affected Skies

Spectral Evaluation of Eyeglass Blocking Efficiency of Ultraviolet/High-energy Visible Blue Light for Ocular Protection

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