Thank you for viewing. Purchased at the end of August, this item is brand new and unused, only opened for the purpose of taking photos for the listing. JINS SCREEN effectively cuts blue light, which can strain your eyes and body. It protects your eyes from blue light emitted by digital devices such as computers and smartphones. For those who work long hours on displays, the JINS SCREEN 40%CUT offers a basic design that isn't too flashy. - Lenses - Blue light cut rate: 40% *Based on EN standard EN ISO12312-1:2022 values, refractive index 1.60, center thickness 2.0mm Visible light transmittance: 84% Ultraviolet transmittance: 0.1% or less Thank you! ^_^