This figure "shows a conceptual simulation of the appearance of the in-the-lens Keplerian telescope." (Credit: Schepens Eye Research Institute) Pretty discrete, isn't? Before going further ...

The bioptic is a spectacle-mounted system consisting of a relatively small telescope (Galilean or Keplerian) mounted in the superior position of a spectacle lens, also called a "carrier lens ...

One of Brueghel’s works appears to show a Keplerian-style telescope in a painting dating from 15 years before this design was thought to have been built. Although various writers in the 16th ...