Ranger Blue Light Readers The Ranger Eco-Process Blue Light Reader will keep eye strain and fatigue at bay with our premium blue light filtering lenses. Our Blue Planet Blue Light Filtering Glasses are available in standard reading strengths 1.00,1.25, 1.50, 1.75, 2.00, 2.25, 2.50 & 3.00. The lenses are built with Blue Light protective technology to prevent eye strain and other harmful effects from the light emitted by digital screens by filtering 40% or more blue light rays emitted by digital devices.