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forms a hard
which research led me to discover was produced by the Grenfell Mission
His head measures about 3" wide
There were a few different plate designs produced
The only flaw on this otherwise excellent condition basket
German Oculus Placido Disk or Keratoscope Opthalmologist Tool antique handicraft forms a hardI 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
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