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What are the markings/etchings on Lenscrafters lenses? Just received new single vision lenses that have an 'O', a 'P', and an 'H' etched in 2 different spots on both lenses. It's very
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Progressive addition lenses Flashcards | Quizlet
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Progressive lens markings | The markings on progressive lenses identify the design, material, addition power and the position of the lens. These markings are from a Varilux Xtrack 3D | By Eyes
progressive lens marking - YouTube
American Optical's Lineage of Multifocal Lenses of the 20th Century, Part Three