Our new lenses technology have been designed to block 70% of harmful blue light from all digital screens and lighting, allowing you stay focused and free from eye strain throughout the day. Size: 49-19-140 Frame: Handmade acetate Lenses: CR-39 - CR-39 lens with anti reflective coating for premium visual clarity. - Blocks out up to 30% of harmful blue-violet light from 400nm to 500nm. - Acetate frames made with spring hinges. - Perfect for long computer screen exposure.