Our Swannies with orange tinted lens block over 99% of blue light between 400-500nm and are designed primarily for wearing in the hours before bedtime, to improve sleep and prevent blue light related sleep problems. This is because blue light between 450-480nm has been shown to suppress the production of melatonin, the sleep-promoting hormone.
At night time, blue light exposure should be limited as much as possible in order to align with the sun going down, which your body uses as the signals to prepare for sleep.
The Day Swannies with almost-clear lens are specifically designed for screen-time during the day. They block between 40-80% of blue light between 400-450nm, which studies are have shown is the most harmful part of the blue light spectrum. They allow some of the blue light between 450-500nm to get through, because blue light exposure during the day important to give your body the signals that it is daytime and that it should be awake. Blue light during the daytime can also help with alertness, memory and cognitive function. The Day Glasses give you these benefits while protecting your eyes from the harmful blue light.
By allowing exposure to the good blue light during the day, and limiting all blue light at night, your body will get the appropriate signals to help regulate its sleep/wake cycle and help you get the best out of both your sleeping and waking hours.