German Oculus Placido Disk or Keratoscope Opthalmologist Tool antique handicraft then hold the copper handle

then hold the copper handle lightly while pulling the string to get it spinning

which may be original to the making

It's seen some use

which research led me to discover was produced by the Grenfell Mission

German Oculus Placido Disk or Keratoscope Opthalmologist Tool antique handicraft then hold the copper handleI 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