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.