The code on the leg of the frame usually refers to the identification information such as the model, style or serial number of the frame. These codes can help consumers or maintenance personnel better understand the detailed information of frames, including brand, model, material, production date and so on.
Glasses of the same style usually have the same code, but there may be differences due to different production batches or customizations. If you want to know more about frames, you can consult the local optical shop or the official customer service of the brand.