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Effects of Temporal Light Modulation on Working Performance, Subjective Visual Fatigue and Pupillary Light Response at 50 lx L&E, Vol.30, No.3, 2022

Light & Engineering 30 (3)

Volume 30
Date of publication 06/06/2022
Pages 17–26

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Effects of Temporal Light Modulation on Working Performance, Subjective Visual Fatigue and Pupillary Light Response at 50 lx L&E, Vol.30, No.3, 2022
Articles authors:
Tianchi Zhang, Jin Yang, Zhengxin Ji, Li Nuoyi, Wei Xu, Yandan Lin

Tianchi Zhang, B.E. He is currently pursuing the MA.Sc degree in the Department of Light Sources and Lighting Engineering, Fudan University. His research interests include human factors in lighting

Jin Yang, MA.Sc. She received the B.S. and MA.Sc. degree in the Department of Light Sources and Lighting Engineering, Fudan University in 2017 and 2020. Her research interests include human factors in lighting and colour

Zhengxin Ji, B.E. He is currently working toward the MA.Eng. degree in Department of Light Sources and Lighting Engineering, Fudan University. His research interests include image processing and colour science

Li Nuoyi, B.E. She is now a Ph.D. student in the Department of Light Source and Lighting Engineering at Fudan University. Her research interests include the nonvisual biological effects of light, including its impact on circadian rhythms, and physiological performance

Wei Xu, Ph.D. Now she is an associate professor of Department of Light Sources and Lighting Engineering, Fudan University. She received excellent morality teacher of Fudan University. Her interests include analysis of lighting systems and lighting measurement studies

Yandan Lin, Ph.D. Now she is full professor of Department of Light Sources and Lighting Engineering, Fudan University. Her research interests include health lighting and colour science. She has taken more than 30 funding projects, including National Natural Science Foundation of China, Special Project for China Commercial Aircraft. She has published more than 100 academic articles

Abstract:
Recent studies revealed that the visual perception of temporal light modulation (TLM), particularly the visibility threshold, were illuminance dependent and subjects exhibited significantly different response at 50 lx. Some novel studies suggested TLM at 50 lx could be particularly useful in terms of promoting alertness and increasing comfort. Therefore, in this study, working performance, subjective visual fatigue and pupillary light response (PLR) were measured under different frequency of TLM at 50 lx to evaluate such phenomenon and its possible application. Results showed that all three parameters measured at 50 lx followed a U-shaped curve with the increasing frequency, instead of the monotonically increasing trend reported in earlier research at relative higher illuminance levels (300–400) lx. Comparing to 100 Hz or 1000 Hz, 300 Hz was the best in terms of visual fatigue (P<0.01) and worst in terms of working performance (P<0.01) while PLR also showed smaller percent change under 316 Hz and 562 Hz (P<0.01). These results supported the hypotheses that at 50 lx illuminance level, the relationship between the effect of TLM and frequency was non-monotonic and was different than the monotonically increasing trend discovered under higher illuminance. Furthermore, such difference not only affects working performance and visual fatigue, but also pupillary light response, which then might affect more physiological outcome. These results could potentially be useful for reducing visual fatigue at scenarios such as operating displays in vehicles or aircrafts at night.
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