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Blue-light transmittance in sunglasses over long-term irradiation within a solar simulator

Blue-light transmittance in sunglasses over long-term irradiation within a solar simulator PurposeHigh-energy visible light (commonly referred to as blue light) transmittance in sunglasses plays an important role in eye safety. Current standards do not have specific requirements for blue light ocular protection, as in the past. However, the literature has warned against potential harm to the eye caused by blue light. The limits imposed in the past state that the average spectral transmission in the 380–500 nm range should not be 20% in excess of the luminous transmittance in the 380–780 nm range. The literature on transmittance evaluations of blue-blocker sunglasses and their aging processes is scarce. Thus, in addition to the transmittance of blue light in sunglasses, this study investigates the limits of these transmittances before and after artificial aging of lenses in a solar simulator.MethodsTwelve sunglasses samples were artificially aged within a solar simulator for a period of 2500 h, which is compatible with a user wearing them for 2 h a day for 2 years. The spectral transmittances of the lenses were measured every 25 h to assess the time evolution of the blue-blocking protection of the lenses, as evaluated by current and old standards.ResultsThe results showed that there were relevant changes in the lenses over time; that is, they considerably weakened their blue light attenuation capabilities. Thus, during the aging process, some lenses exhibited increased blue light transmittance compared to the visible one, exceeding the 120% criterion established by a superseded standard.ConclusionThe results suggest that aging tests should be performed on sunglasses not only for ultraviolet radiation, as required by most standards, but also for blue light. Furthermore, the standards should include constraints on blue light attenuation. In the context of public health and preventive medicine, evaluation of blue blockers from various perspectives is of ongoing interest. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Biomedical Engineering Springer Journals

Blue-light transmittance in sunglasses over long-term irradiation within a solar simulator

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Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to The Brazilian Society of Biomedical Engineering 2022. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
2446-4732
eISSN
2446-4740
DOI
10.1007/s42600-022-00251-x
Publisher site
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Abstract

PurposeHigh-energy visible light (commonly referred to as blue light) transmittance in sunglasses plays an important role in eye safety. Current standards do not have specific requirements for blue light ocular protection, as in the past. However, the literature has warned against potential harm to the eye caused by blue light. The limits imposed in the past state that the average spectral transmission in the 380–500 nm range should not be 20% in excess of the luminous transmittance in the 380–780 nm range. The literature on transmittance evaluations of blue-blocker sunglasses and their aging processes is scarce. Thus, in addition to the transmittance of blue light in sunglasses, this study investigates the limits of these transmittances before and after artificial aging of lenses in a solar simulator.MethodsTwelve sunglasses samples were artificially aged within a solar simulator for a period of 2500 h, which is compatible with a user wearing them for 2 h a day for 2 years. The spectral transmittances of the lenses were measured every 25 h to assess the time evolution of the blue-blocking protection of the lenses, as evaluated by current and old standards.ResultsThe results showed that there were relevant changes in the lenses over time; that is, they considerably weakened their blue light attenuation capabilities. Thus, during the aging process, some lenses exhibited increased blue light transmittance compared to the visible one, exceeding the 120% criterion established by a superseded standard.ConclusionThe results suggest that aging tests should be performed on sunglasses not only for ultraviolet radiation, as required by most standards, but also for blue light. Furthermore, the standards should include constraints on blue light attenuation. In the context of public health and preventive medicine, evaluation of blue blockers from various perspectives is of ongoing interest.

Journal

Research on Biomedical Engineering – Springer Journals

Published: Mar 1, 2023

Keywords: Aging test of sunglasses; Blue light transmittance; Sunglasses standards; Solar simulator

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