cheerfulness vs rose-colored glasses

cheerfulness

noun
  • The state of being cheerful; joy. 

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 cheerfulness and rose-colored glasses occurred in a corpus of books? (source: Google Ngram Viewer )