Analysis of circadian properties and healthy levels of blue light from smartphones at night

This study proposes representative figures of merit for circadian and vision performance for healthy and efficient use of smartphone displays. The recently developed figures of merit for circadian luminous efficacy of radiation (CER) and circadian illuminance (CIL) related to human health and circad...

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Bibliographic Details
Published in:Scientific reports 2015-06, Vol.5 (1), p.11325-11325, Article 11325
Main Authors: Oh, Ji Hye, Yoo, Heeyeon, Park, Hoo Keun, Do, Young Rag
Format: Article
Language:English
Subjects:
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639/624/1075/146
Brightness
Circadian rhythm
Circadian Rhythm - radiation effects
Circadian rhythms
Eye
Health Status
Humanities and Social Sciences
Humans
Light - adverse effects
Melatonin
multidisciplinary
Optical properties
Photic Stimulation
Science
Smartphone
Smartphones
Social organization
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Summary:This study proposes representative figures of merit for circadian and vision performance for healthy and efficient use of smartphone displays. The recently developed figures of merit for circadian luminous efficacy of radiation (CER) and circadian illuminance (CIL) related to human health and circadian rhythm were measured to compare three kinds of commercial smartphone displays. The CIL values for social network service (SNS) messenger screens from all three displays were higher than 41.3 biolux (blx) in a dark room at night and the highest CIL value reached 50.9 blx. These CIL values corresponded to melatonin suppression values (MSVs) of 7.3% and 11.4%, respectively. Moreover, smartphone use in a bright room at night had much higher CIL and MSV values (58.7 ~ 105.2 blx and 15.4 ~ 36.1%, respectively). This study also analyzed the nonvisual and visual optical properties of the three smartphone displays while varying the distance between the screen and eye and controlling the brightness setting. Finally, a method to possibly attenuate the unhealthy effects of smartphone displays was proposed and investigated by decreasing the emitting wavelength of blue LEDs in a smartphone LCD backlight and subsequently reducing the circadian effect of the display.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep11325