Is that really true? I see free frames advertised all the time, but we all know how “free” those kinds of deals actually are. But if I think about it, the frame is just a piece of plastic/metal and can be mass produced. The lenses themselves need to be specifically ground and fitted for that exact person, often with a difference for each eye. From what I understand this is still partly manual work, even though the machine does the grinding, an operator needs to set it all up and check the result. With often a couple of passes needed to get it just right. And those special coatings they apply aren’t cheap either. So I wonder where the actual cost is.