Hi… I just found this place and want to get some useful information about prescription glasses here. I have got one question about glasses lens. Some people know that there are many type of glasses lens nowadays. And many types that we didn’t realize of. the optical shop assistant advise me to order one pair of glasses with Free Form lens. But what is Free From lens?? She just told me this is a new kind of technology. But I need to know the detail about it. Who can tell me? thank you.