tunnel vision
Noun

tunnel vision (uncountable)

  1. A restricted field of vision as the result of looking through some type of object or a medical condition.
    It took some time for him to get used to the tunnel vision he experienced while looking through a periscope.
    • 2000, Mark L. Warner, The Complete Guide to Alzheimer's—Proofing Your Home, Purdue University Press (ISBN 9781557532206), page 378:
      Often people with AD have a form of tunnel vision and don't see obstacles […]
    • 2008, Curt R. Bartol, Anne M. Bartol, Introduction to Forensic Psychology: Research and Application, SAGE (ISBN 9781412958301), page 64:
      The most frequent visual distortion was “tunnel vision,” in which the officer became so focused on one object that everything else at the scene went unnoticed. This phenomenon is frequently experienced by victims of a terrifying event as well.
  2. (figuratively) The tendency to focus one's attention on one specific idea or viewpoint, to the exclusion of everything else.
    Synonyms: one-track mind
    After Mark fell victim to tunnel vision, nothing you could say to him would change his mind.
    • 2014, Paul Nijar, Everything I Thought I Was & What I Came to Be, Xlibris Corporation (ISBN 9781499030716), page 209:
      Having friends that are too much like yourself force you to have a tunnel vision. I believe tunnel vision is a form of blindness. Your span of thinking becomes too narrow, and you close yourself off of so many other great ways of thinking in life.
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