So, what are we looking at? To start, the wavelength of visible light is between 380-780nm. High energy visible light (HEV) is between 380-500nm and may cause damage to your eyes. HEV light includes blue-violet light between 400-455nm, which can potentially damage your eyes, and blue-turquoise light between 460-500nm, a major synchronizer of biorhythms. The most powerful source of blue-violet light is the sun, by far. Blue light filtering glasses help to protect your eyes and make your vision comfortable.