pair of eyeglasses vs pair of glasses

pair of eyeglasses

noun

  • A pair of lenses set in a frame worn on the nose and ears in order to correct deficiencies in eyesight or to ornament the face. 

pair of glasses

noun

  • A pair of lenses set in a frame worn on the nose and ears in order to correct deficiencies in eyesight or to ornament the face. 

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