eyeglass vs monocle

eyeglass

noun
  • An artificial lens, especially one of a pair. 

  • An eyepiece. 

  • A monocle. 

monocle

noun
  • A single lens, usually in a wire frame, and used to correct vision for only one eye. 

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