expectancy vs rose-colored glasses

expectancy

noun
  • Expectation or anticipation; the state of expecting something. 

  • The state of being expected. 

  • Future interest as to possession or enjoyment 

rose-colored glasses

noun
  • An optimistic perception of something; a positive opinion; seeing something in a positive way, often thinking of it as better than it actually is. 

  • Used other than figuratively or idiomatically: see rose-colored, glasses. 

How often have the words expectancy and rose-colored glasses occurred in a corpus of books? (source: Google Ngram Viewer )