What is Blue light?
Visible light or UV and non-visible light are made up of a range of wavelength from red, orange , yellow, green , blue, violet. On the spectrum it ranges from 380-780 nanometers. This is UV light to infrared. Blue Light is known as” high energy visible” or HEV. It is the range of blue/turquoise – blue /violet. On the spectrum it is between 380-500 nanometers. 1/3 of visible light is HEV or blue light.
Exposure to Blue Light can be found indoors and outdoors.
Indoors it s found in anything with LED lighting. From digital devices such as computer screens tablet, digital phones, Flat Screen TV, to Led and fluorescent lighting.
Outdoors the Sun is a source of Blue Light even more so than what you might experience indoors, Even light from a cars headlight to new street lighting, all emit Blue Light.
Pros and Cons to Blue Light
Pros: In nature outdoors the wavelength of Blue Light is what is responsible for making the sky look blue. Therefore it gives a sense of increased energy, the feeling of being awake and focused and mainly it regulates our sleep cycle, our Circadian rhythms
Cons: One large drawback to continuous exposure to Blue Light is eye fatigue, eye strain and headaches. To much exposure to devices especially into late hours in the evening can cause insomnia. Because Blue Light penetrates the Retina it can damage cells in the Retina. The damaged cells may increase the risk of macular degeneration.
Benefits of Blue Filter
When an optical lens has blue filter it protects cells in the Retina, it reduces eye fatigue and headaches and increase contrast when viewing digital devices. All in all it is more comfortable for your eyes and aids in optimal vision
Who should be using Blue Filter lenses
Blue Filter is for everyone. Anyone young or older who is using digital devices over extended periods of time such as gaming with youth to prolonged office work in front of a screen with students to millennials to adults. Even seniors that are post cataract will benefit from the filter, some implants may or may not have a filter.
Michael Edward McGrath
Licensed Optician #1336