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Background
Blue wavelengths are thought to have an effect on circadian rhythms. Using a smartphone, which emits a 453 nm blue light, can worsen the quality of sleep.
Aims
To study the skin changes caused by poor sleep quality induced by smartphone usage.
Methods
The participants were 22 Korean women aged 20–39 years, with no sleep problems and a Pittsburgh Sleep Quality Index (PSQI) score of...
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