This is not a straightforward question and the short answer is: it depends. To understand why, it helps to understand a little more about how blue light operates on the light spectrum.
Blue light is a form of High Energy Visible light (HEV) which operates on the light spectrum between 400-500 nanometers.
The closer the wavelength is to the UV spectrum, the greater the risk of harmful effects to your eyes. This is why blue light between the range of 400-450 nanometers is generally considered ‘bad blue light’. Studies have shown that blue light in this range in particular, may increase the likelihood of age-related macular degeneration.
However, some blue light is good for your health, and arguably necessary. Studies have shown that blue light can boost alertness, help memory and cognitive function and elevate mood, as well as playing an important part in regulating your circadian rhythm.
So how do you get the benefits of blue light without the harmful effects that come along with it? By blocking only the harmful part of the blue light spectrum from 400-450nm, but allowing blue light between 450-500nm to get through, Swannies Day Glasses do just this.