Nowadays, we spend more time using a wide variety of digital devices to work, learn and be entertained. Recent digital screens are often equipped with powerful light source such as LED. These digital screens emit intense blue light and can cause eye strain after long exposure. Nikon have developed a lens coating that can be specified when ordering new lenses called SeeCoat Blue which provides a solution to such stressful conditions. Please ask us about this when you next need new specs.