Faculty of Physical-Mathematical Sciences, Autonomous University of Sinaloa, Culiacan, Sinaloa, Mexico.
División de Física Aplicada, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, Mexico.
Optom Vis Sci. 2020 Mar;97(3):207-217. doi: 10.1097/OPX.0000000000001485.
Electronic display devices used before bed may negatively affect sleep quality through the effects of short-wavelength (blue) light on melatonin production and the circadian cycle. We quantified the efficacy of night-mode functions and blue-light-reducing lenses in ameliorating this problem.
The purpose of this study was to compare the radiation produced by smartphones that reaches the eye when using night-mode functions or blue-light-reducing spectacle lenses.
Radiant flux of 64 smartphones was measured with an integrating sphere. The retinal illuminance was calculated from the radiant flux of the smartphones. For the night-mode functions, the spectra produced by the smartphones were measured. The transmittance of four blue-light-reducing spectacle lenses, which filter light with either antireflective coatings or tints, was measured using a spectrometer. To determine the impact of blue-light-reducing spectacles, the radiant flux of the smartphone was weighted by the transmission spectrum of these glasses. Visual and nonvisual (circadian) parameters were calculated to compute the melatonin suppression values (MSVs) through a logistic fitting of previously published data. The MSV was used as the figure of merit to evaluate the performance of blue-light spectacles and smartphone night-mode functions.
Night-mode functions in smartphones reduced MSVs by up to 93%. The warmest mode produced the least suppression. Blue-light-reducing spectacles reduced melatonin suppression by 33%, the coated lenses being more efficient than tinted lenses.
All smartphones in this study emit radiant power in the short-wavelength region of the visible spectrum. Such smartphones may impair the regulation of circadian cycles at nighttime. The activation of night-mode functions was more efficient than the commercially available blue-light-reducing spectacle lenses in reducing the amount of short-wavelength light (up to 2.25 times). These results can be extrapolated to most electronic devices because they share the same type of white radiant sources with smartphones.
睡前使用电子显示设备可能会通过短波长（蓝光）对褪黑素产生和昼夜节律的影响，对睡眠质量产生负面影响。我们量化了夜间模式功能和防蓝光镜片在改善这一问题方面的效果。
本研究的目的是比较使用夜间模式功能或防蓝光眼镜时智能手机到达眼睛的辐射。
使用积分球测量 64 部智能手机的辐射通量。从智能手机的辐射通量计算视网膜照度。对于夜间模式功能，测量智能手机产生的光谱。使用分光光度计测量四种防蓝光眼镜的透光率，这些眼镜通过防反射涂层或镜片颜色来过滤光线。为了确定防蓝光眼镜的影响，智能手机的辐射通量按这些眼镜的传输光谱进行加权。通过对先前发表的数据进行逻辑拟合，计算视觉和非视觉（昼夜节律）参数，以计算褪黑素抑制值（MSV）。MSV 被用作评估蓝光眼镜和智能手机夜间模式功能性能的指标。
智能手机的夜间模式功能将 MSV 降低了多达 93%。最温暖的模式产生的抑制作用最小。防蓝光眼镜将褪黑素抑制作用降低了 33%，涂层镜片比有色镜片更有效。
本研究中的所有智能手机在可见光谱的短波长区域都发出辐射功率。这样的智能手机可能会破坏夜间生物钟的调节。与市售的防蓝光眼镜相比，夜间模式功能的激活在减少短波长光的量方面更有效（高达 2.25 倍）。由于它们与智能手机具有相同类型的白色辐射源，因此这些结果可以推广到大多数电子设备。
