These days, it’s impossible to escape blue light. TVs, computers, smartphones, tablets and e-readers bombard our eyes with blue light emissions day and night.
Electronic devices aren’t the only culprits. Energy-saving light bulbs (notably LEDs) may be “green” but they also emit a significant proportion of blue light (also known as High-Energy Visible [HEV] light). While present in natural light, blue light occurs in abnormal proportions in artificial light sources.
Blue/HEV light covers wavelengths from 380 to 500 nanometers (nm). Although the eyes’ natural filters block UV light, they do not block blue/HEV light, meaning it is able to pass through the cornea, the crystalline lens and the vitreous and potentially damage the retina. HEV light is toxic for the crystalline lens and retina which can lead to retinal cell death and early cataract formation.