German Oculus Placido Disk or Keratoscope Opthalmologist Tool antique handicraft There were a few different

There were a few different plate designs produced

Nuanced and unique from every angle

The smaller measures 4 1/2" wide x 2 1/2" tall

The only flaw on this otherwise excellent condition basket

German Oculus Placido Disk or Keratoscope Opthalmologist Tool antique handicraft There were a few differentI bought this old Placido Disk, or Keratoscope, not knowing exactly what it was, because it reminded me of Duchamp's "Rotoreliefs," and also because I thought it could serve as a great prop for all sorts of things, including perhaps a low budget Sci Fi film! I've since learned that this device, invented in the late 19th century, is an ophthalmic instrument used to assess the shape of the anterior surface of the cornea: a series of concentric rings is