The Italians or Fielmann haven't figured out that yet.
Modo (NY) has some lightweight frames made in Japan, including a screwless line, for 50% less.
Eyebuydirect (owned by EssilorLuxottica) has a lightweight metal frame with grooved lens mounting, for 95% less.
I was talking about invisible frames and invisible glasses, as light as possible.
The Italians or Fielmann haven't figured out that yet.