Blue Light is a part of the visible light spectrum, between 400 nm and 500 nm; making it one of the shortest, highest-energy wavelengths. Digital devices and LED lights emit blue light from about 430 nm to 500 nm with an intense spike at ~ 455 nm.
Approximately one-third of all visible light is considered high-energy visible (HEV) or “blue” light.
Exposure can come from Sunlight or Artificial Light. The sun is primary source of harmful UV light and intense blue light that decreases visual clarity and can potentially harm your retina.
Sunlight contains red, orange, yellow, green and blue light rays and many shades of each of these colours, depending on the energy and wavelength of the individual rays (also called electromagnetic radiation). Combined, this spectrum of coloured light rays creates what we call “white light” or sunlight.
Without getting into complicated physics, there is an inverse relationship between the wavelength of light rays and the amount of energy they contain. Light rays that have relatively long wavelengths contain less energy, and those with short wavelengths have more energy.
Rays on the red end of the visible light spectrum have longer wavelengths and, therefore, less energy. Rays on the blue end of the spectrum have shorter wavelengths and more energy.
Our indoor lifestyle now revolves around digital devices and artificial lights, bathing us in blue light. Artificial blue light from screens and energy-efficient lighting disrupts your biological clock and causes digital eye strain— negatively impacting sleep, health, and productivity.
Because short-wavelength, high energy blue light scatters more easily than other visible light, it is not as easily focused. When you’re looking at computer screens and other digital devices that emit significant amounts of blue light, this unfocused visual “noise” reduces contrast and can contribute to numerous health and sleep problems; including eyestrain, migraines, and fatigue.
Research has shown that lenses that block blue light with wavelengths less than 450 nm (blue-violet light) increase contrast significantly. But not lenses that block blue light are the same. Blue light lenses should be made to protect at the minimum of 455nm. Digital devices and LED lights emit blue light from about 430nm to 500nm, with an intense spike at 455nm.
Majority of blue light blocking lenses do not provide that. They only provide blocking percentages in the part of the spectrum where digital devices emit little to no blue light, making their protection insignificant.
The average blue light filter coating only blocks 9% of the harmful blue light, and blue light filter clear lenses only 3%. At Eyelation we recommend blue light lens options by BluTech, that filter out from 41-59% of the blue light, reducing your exposure and helping you live healthier and happier.
*Content and Images Sited from BluTech lenses & The Canadian Association of Optometry