【22-Piece Progressive Lens Set】: Complete set includes 11 diopter options (1.0 to 3.50, 0.25 increments) with 2 lenses per diopter (one for each eye), totaling 22 high-quality progressive multifocal lenses, perfect for professional vision care use 【User-Friendly Widened Design】: Widened gap between lenses allows quick, easy retrieval and placement; integrated protective slots securely hold each lens, preventing slipping, scratches, and breakage during storage and use 【High-Definition Optical Glass】: 36mm clear optical center ensures a wide, unobstructed field of view; high-transmission glass delivers crisp, true-to-life vision, while the smooth surface is easy to clean and resistant to smudges for long-term clarity 【Durable Metal Frame】: Crafted from premium, sturdy metal, the frame offers exceptional durability and stability, standing up to daily frequent use without loosening, bending, or damage—ideal for busy optical workplaces 【Versatile Professional Use】: Designed for opticians, vision care centers, hospital ophthalmology departments, and educational institutions—suitable for commercial, medical, and educational vision care scenarios