Definition of tunnel vision noun from the Oxford Advanced Learner's Dictionary

     

    tunnel vision

     noun
    noun
    BrE
     
    ; NAmE
     
    [uncountable]
     
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  1. 1 (medical) a condition in which somebody cannot see things that are not straight ahead of them
  2. 2(disapproving) an inability to see or understand all the aspects of a situation, an argument, etc. instead of just one part of it
See the Oxford Advanced American Dictionary entry: tunnel vision