tunnel vision

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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.
  2. (figuratively) To focus one's attention on one specific item or event, to the exclusion of everything else.; a one-track mind
    After Mark fell victim to tunnel vision, nothing you could say to him would change his mind.