The potential ‘blue light hazard’ from LED headlamps

Price, Richard; Labrie, D.; Sullivan, Braden; Sliney, David H.

doi:10.1016/j.jdent.2022.104226

Cited by 8 publications

(8 citation statements)

References 52 publications

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“…Dental dams of different colours are frequently utilised in dental clinics. For this investigation, we exclusively utilised a dam with a blue hue since it highly reflected blue wavelengths of incoming light and heightened the potential for BLH [24].…”

Section: Radiance Measurementsmentioning

confidence: 99%

The potential retinal blue hazard from dental examination lamps at different ages

Alzahrani

2024

Preprint

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Background Dental examination lamps (DELs) enhance visual acuity and focus during surgical procedures and clinical exams in dental clinics. Prolonged exposure to high-intensity light can cause thermal burns and toxicities in eyes. This study examined the risk of damage to the eyes from blue radiation emitted by DELs, considering lens spectral transmission at different ages. Methods The spectrum irradiance of 14 types of DELs manufactured by 14 companies was measured using a Hopoocolour OHSP350S spectrometer. The blue weighted radiances (LB) were computed for direct viewing at 30 cm and indirect viewing at distances of 30 cm, 50 cm, and 100 cm. The maximum daily exposure duration (tmax) was computed only for the direct viewing of light across different ages (1–70 years old). Results LED-based DELs have peak blue spectral radiances of between 440 and 450 nm. Indirectly viewing any of the tested DELs is safe. DEL characteristics and human eye light transmission at different ages determined the direct viewing LB values as ranging from 3 to 483 W.m-2.sr-1. Luna, with the lowest blue light radiance of 0.09 ± 0.05, has the longest tmax value. The shortest tmax value was obtained with SKEMA 6, which had the highest mean blue light radiance of 4.75 ± 3.41. Conclusion Retinal tissue damage from cumulative direct light viewing decreases from 1 to 70 years of age. This decrease in retinal tissue damage rises with blue light radiance. The maximum acceptable ocular exposure limits for DELs and ages were computed to inform decisions on avoiding blue light.

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Section: Radiance Measurementsmentioning

confidence: 99%

The potential retinal blue hazard from dental examination lamps at different ages

Alzahrani

2024

Preprint

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“…Various light sources are candidates for this purpose. Light-emitting diode (LED) light bulbs have been used for both chair-side [4][5][6][7] and laboratory light polymerization units [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Improvement in working environment of wet rotary cast trimmer by means of light-emitting diode light bulbs

Kiuchi,

Imai

2024

Asian Pac J Dent

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Purpose:The aim of the present study was to evaluate the irradiance of light-emitting diode (LED) light bulbs seated around the abrasive grinding disc of a wet laboratory cast trimmer for the enhancement of environmental brightness. Methods: A total of 12 LED light bulbs were set up along the inner framework of a rotary cast trimmer. The irradiance of the bulbs was determined with a spectral radiometer. Results: The spectral irradiance mean of 12 LED light bulbs in the cast trimmer was 37.3 µW/cm 2 and the value was significantly greater than that of the control. The irradiance median of the 9787 LED light bulb varied from 640.3 µW/cm 2 for 0 mm distance to 79.4 µW/cm 2 for 200 mm distance. Analysis revealed that irradiance was not statistically affected by the bulb-sensor vertical distances within 50 mm. Conclusion:The working environment, especially brightness, around a dental stone cast placed on the trimmer stage can be improved considerably through the use of the LED light bulbs.

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“…Given the gradual shift in teaching media, what concerns the general public is whether such eLearning would impose threats on eyes, by noting blue enriched white light to be hazardous to retina and macula etc [ [8] , [9] , [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] , [20] , [21] , [22] , [23] ]. Taking retinal damage for example, Ham et al revealed the photochemical sensitivity of retina to light to increase with the decrease of wavelength, explaining why retina is more vulnerable to the short wavelength blue light [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…To explore if some of the threats can be quantified, a few studies were carried out about the effect of wavelength on photoretinitis [ [8] , [9] , [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] , [20] , [21] , [22] , [23] ]. The threat was quantified via the use of a permissible exposure-limit [ [24] , [25] , [26] , [27] , [28] , [29] , [30] , [31] , [32] , [33] , [34] , [35] , [36] , [37] , [38] ].…”

Section: Introductionmentioning

confidence: 99%