concept vs tunnel vision

concept

noun
  • Understanding retained in the mind, from experience, reasoning and imagination; a generalization (generic, basic form), or abstraction (mental impression), of a particular set of instances or occurrences (specific, though different, recorded manifestations of the concept). 

  • An abstract and general idea; an abstraction. 

  • A description of supported operations on a type, including their syntax and semantics. 

verb
  • to conceive; to dream up 

tunnel vision

noun
  • The tendency to focus one's attention on one specific idea or viewpoint, to the exclusion of everything else. 

  • A restricted field of vision as the result of looking through some type of object or a medical condition. 

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