tunnel vision

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.

Origin:
1940–45

tun·nel-vi·sioned, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To tunnel vision
Collins
World English Dictionary
tunnel vision
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Tunnel vision is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
American Heritage
Medical Dictionary

tunnel vision n.
vision in which the visual field is severely constricted.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Avoid tunnel vision that results in focusing on one injury and not others.
Talk about the selfish tunnel vision of the privileged.
Perhaps it's unfair of me, but it seems to me that there's a lot of tunnel
  vision in these proposals.
Distracted drivers experience what researchers call inattention blindness,
  similar to that of tunnel vision.
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