exotropia vs walleye

exotropia

noun
  • A form of strabismus in which the eyes deviate outwards. 

walleye

noun
  • One or a pair of sideways-looking misaligned eyes. 

  • An unusually pale eye. 

  • A species of gamefish, Sander vitreus, native to the Northern U.S. and Canada with pale, reflective eyes. 

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