Amber lenses to block blue light and improve sleep: a randomized trial.

@article{Burkhart2009AmberLT,
  title={Amber lenses to block blue light and improve sleep: a randomized trial.},
  author={Kimberly Burkhart and James R. Phelps},
  journal={Chronobiology international},
  year={2009},
  volume={26 8},
  pages={
          1602-12
        }
}
All light is not equal: blue wavelengths are the most potent portion of the visible electromagnetic spectrum for circadian regulation. Therefore, blocking blue light could create a form of physiologic darkness. Because the timing and quantity of light and darkness both affect sleep, evening use of amber lenses to block blue light might affect sleep quality. Mood is also affected by light and sleep; therefore, mood might be affected by blue light blockade. In this study, 20 adult volunteers were… 
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