Costco Optical Lab is one of two wholly-owned optical labs that make custom eye wear for Costco customers. The Costco Optical Lab in National City, CA (near San Diego) makes more than 10,000 pairs of glasses daily in their 700 person lab. The lab operates 6.5 days per week, 24 hours per day. Costco Optical Lab started its lean journey five years ago. Known for its commitment to Kaizen, Kanban, visual controls and a total employee involvement in their “My Kaizen Idea” program, the Costco Optical Lab lean journey has resulted in significant cultural changes and millions of dollars in savings. See more at costco.com.