we are the manufacturer of optical lens in Dangyang(it is famous for optical lens),Jiangsu,China,we have more than 20 years experiences in this line,and there are more than 1000 workers in our factory,we have 10 coating machines and 10 hard-coating machines which are imported from Korea,we can delivery 30000 pair optical lens every day!our main products are:CR-39UC,HC,HMC,HMC EMI,bifocal len(round top and flat top), HCT and progressive lens,156 UC,HC,HMC,HMC EMI,aspherical, photochromic,HCT and progressive ,and we also produce mineral glass,such as 1.523 UV white,photochromic,and some of high index lens,such like 1.70series,any question you have,please contact me freely!i am aileen Yu(Ms), thanks and best regards!