sapphire blue coatings is introduced specially developed for customers who spend a lot of their time indoors and are exposed to blue-violet light from LEDs as well as TV, computer or tablet screens. SAPHHIRE' blue light coatings for spectacle lenses block specific wavelengths of light, and can help to relieve the eyestrain perceived by the customers which is typically associated with blue light exposure.
The range between 390 and 440nm of the light spectrum is considered to be the potentially harmful part of the HEV spectrum. It is everywhere, although its intensity varies greatly. While a typical LCD computer monitor produces a brightness of 250cd/m2, a clear blue sky at midday is 32 times as bright. Direct sunlight can be thousands of times as bright
