Evaluation of Photobiological Effects in Different Age Groups

Xiaoming, 周晓明 Zhou; Dandan, 刘丹丹 Liu

doi:10.3788/fgxb20173806.0721

Cited by 2 publications

(1 citation statement)

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“…The present study examined the spectrum radiance that effectively reaches the retina of human eyes at various ages, defined as L(λ). (T n (λ)/ T 32 (λ)) [29,30] where T n (λ) denotes the transmittance of human eyes at the age of n years.…”

Section: Retinal Blue Light Hazard Exposure Limit For Different Agesmentioning

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: Retinal Blue Light Hazard Exposure Limit For Different Agesmentioning

confidence: 99%

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

Alzahrani

2024

Preprint

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Change of circadian effect with colour temperature and eye spectral transmittance at different ages

Tian

Chen

et al. 2020

Lighting Research & Technology

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With the recent advances in photobiology research and light-emitting diode technology, considering the circadian effects and the potential health benefits of lighting has attracted much attention. In this work, to achieve a white light-emitting LED cluster with beneficial and tunable circadian effects, a red-green-blue-warm white colour-mixing method based on pulse width modulation has been introduced and developed. Five optimal spectral power distributions were achieved with the correlated colour temperatures of 2700, 4000, 5000, 6500 and 8000 K that provide maximum colour-rendering indices of 95.0, 96.6, 96.8, 95.6 and 93.5 for each correlated colour temperature. Moreover, the Bellia model was modified to take into account the reduction in spectral transmittance of the human eye that occurs with age. Using the five spectral power distributions, based on the eye spectral transmittance with age-related change, we studied the change of the circadian effect with corneal illuminance at the different correlated colour temperatures. Solutions are provided for scenarios where circadian effect should be avoided for different age groups while the reasonable illuminance and colour temperature are maintained.

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Evaluation of Photobiological Effects in Different Age Groups

Cited by 2 publications

References 0 publications

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

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

Change of circadian effect with colour temperature and eye spectral transmittance at different ages

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