Panther X6 - Progressive lensesVolume discount will be applied automatically at checkout. The success of our Progressive Lens technology has provide us with the opportunity to continue this special lens science. We have introduced four new lens technologies for 2021 that utilize our new Chromashift coating technology and enhance dyes and pigments to dial up the efficacy of these lenses. The four new lenses provide a super spectrum of usage from green background neutralization to