pair of sunglasses vs pince-nez

pair of sunglasses

noun
  • A pair of glasses with tinted lenses designed to protect the eyes from sunlight. 

pince-nez

noun
  • temple-less eyeglasses that clip to the bridge of the nose 

How often have the words pair of sunglasses and pince-nez occurred in a corpus of books? (source: Google Ngram Viewer )