sunglasses vs trifocals

sunglasses

noun
  • Tinted glasses worn to protect the eyes from the sun. 

  • A person wearing sunglasses 

trifocals

noun
  • Spectacles with corrective lenses that have three different powers per eye. 

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