LTL is among the world's leading producers of mineral ophthalmic lenses, in an index range between 1,523 and 1,900. All lenses, even highly specialized products, are made with the highest quality raw materials supplied by the major industry leaders and are carefully tested and verified at every stage of processing following the highest standards on the market. All LTL lenses comply with Regulation (UE) 2017/745 on Class 1 medical devices.