English

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.‎

2. (figuratively) The tendency to focus one's attention on one specific idea or viewpoint, 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.‎

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