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Chronobiol Int. 2016;33(1):134-9. doi: 10.3109/07420528.2015.1119158. Epub 2016 Jan 5.

Protective effect of blue-light shield eyewear for adults against light pollution from self-luminous devices used at night.

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a Department of Ophthalmology , Keio University School of Medicine , Shinjuku , Tokyo , Japan.
b Department of Biology , Tokyo Medical and Dental University , Ichikawa , Chiba , Japan.


We investigated sleep quality and melatonin in 12 adults who wore blue-light shield or control eyewear 2 hours before sleep while using a self-luminous portable device, and assessed visual quality for the two eyewear types. Overnight melatonin secretion was significantly higher after using the blue-light shield (P < 0.05) than with the control eyewear. Sleep efficacy and sleep latency were significantly superior for wearers of the blue-light shield (P < 0.05 for both), and this group reported greater sleepiness during portable device use compared to those using the control eyewear. Participants rated the blue-light shield as providing acceptable visual quality.


Blue-light; eye fatigue; eyewear; light pollution; melatonin; retinal ganglion cells; sleep

[Indexed for MEDLINE]

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