haploscopic vs stereoscopic

haploscopic

adj
  • Relating to, or by means of a haploscope 

stereoscopic

adj
  • Of or relating to the stereoscope. 

  • Designed to be used by both eyes simultaneously, or obtained by imaging from two viewpoints simultaneously. 

  • Of or relating to stereoscopy; three-dimensional. 

How often have the words haploscopic and stereoscopic occurred in a corpus of books? (source: Google Ngram Viewer )