Progressive semi-finished lens offers an optimal balance of clarity and affordability. The blank (or “puck”) features a smooth, seamless progression design for natural vision correction from distance to near. Using advanced casting technology with UV inhibitors and initiators, it ensures durable, distortion-free optics with built-in UV protection. As a semi-finished product, it allows precise surfacing into customized progressive prescriptions while maintaining CR-39’s signature lightweight comfort and high Abbe value for reduced chromatic aberration.