These specs are fabricated; using brass, copper, nickel, and other steel whats-its and do-hickies. I imagine a mad scientist or crazed train conductor wearing these massive specs.
I personally like this design movement for its contemporary approach to Victorian design and the dedication to craft. Most of the works I've found online are usually well crafted and appear to be completely functionable. If you know my work, I aspire to perfect my craft and it is important to me that an object be well designed and completely functionable for its task.