Progressive Lens of each company have the same primary structure, but it is the details that are different, so different properties. Each company will have a wealth of different lenses for different purposes. The company that manufactures the lens, it is not just the two companies also have a SOLA (USA), Rodenstock (Germany) to apply the lens of each progressive companies in both Europe and Asia, there are several versions of it for several lens design therefore buying would see many elements such as size (b)Angok around. How to use a high portion of long-term vision, etc. Therefore, there is only a single lens design is not appropriate for everyone in each company will have different prices, ranging from lenses is to expensive. It differs in that it is often less expensive versions of the lens distortion of the phapboriwen side is less than or close to the stage view is wider than.
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