Gunnar Optiks JOU-00103 Joule Full Rim Color Enhanced Computer Glasses with Crystalline Lens for Graphic Designers, Onyx Frame Finish i-AMP technology and Crystalline lens is engineered for the graphic designer, editor or artist that requires an equally balanced color spectrum to design and edit in true color Made of acetate with an onyx frame finish and proper weight balance to guarantee longwearing comfort without pressure points or fatigue Medium fit frame with a single piece front construction that eliminates all welds, screws and other potential points of failure European handcrafted materials provide rich detail and multi-layered acetates catch and reflect light showing off the rich and modernistic design Comes with a 1-year limited warranty against manufacturing defects