ocular vs optics

ocular

noun
  • The eyepiece of a microscope or other optical instrument. 

  • Any of the scales forming the margin of a reptile's eye. 

adj
  • Seen by, or seeing with, the eye; visual. 

  • Of, or relating to the eye, or the sense of sight 

  • Resembling the eye. 

optics

noun
  • The physics of light and vision. 

  • Perception, image, public relations, especially in politics. 

  • The light-related aspects of a device. 

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