Why not block all blue light all the time?

Some degree of blue light exposure is considered necessary for for good health. Studies have shown the benefits of blue light in relation to regulating circadian rhythm, boosting alertness and reducing seasonal affective disorder.

As it is primarily the lower part of the blue light spectrum operating between 400-450 nanometers which is considered most harmful, allowing exposure to  the higher end of the blue spectrum between 450-500 nanometers during the day, is actually a good thing. It helps you stay alert and awake during the day by letting your body know that it is daytime.

After sunset, we recommend reducing exposure to all blue light (between 400-500nm) as this will give your body the signals it needs to prepare for sleep, and encourage the production of melatonin, the sleep-promoting hormone.

This is because what may be ‘good’ blue light during the day, becomes ‘bad’ blue light in the evening, as research has shown that blue light between 400-480nm can suppress the production of melatonin. For evening, we recommend the Swannies Night Glasses (with orange tint) for full spectrum blue light protection.