visual vs visual acuity

visual

noun
  • Any element of something that depends on sight. 

  • All the visual elements of a multimedia presentation or entertainment, usually in contrast with normal text or audio. 

  • An image; a picture; a graphic. 

  • A preliminary sketch. 

adj
  • Related to or affecting the vision. 

visual acuity

noun
  • The sharpness of vision or sight. 

  • Strength of vision expressed on some definite scale. 

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