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tunnel vision

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noun
  1. a drastically narrowed field of vision, as in looking through a tube, symptomatic of retinitis pigmentosa.
  2. an extremely narrow or prejudiced outlook; narrow-mindedness.
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Origin of tunnel vision

First recorded in 1940–45
Related formstun·nel-vi·sioned, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for tunnel vision

tunnel vision

noun
  1. a condition in which peripheral vision is greatly restricted
  2. narrowness of viewpoint resulting from concentration on a single idea, opinion, etc, to the exclusion of others
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

tunnel vision in Medicine

tunnel vision

n.
  1. Vision in which the visual field is severely constricted.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.