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

tunnel-visioned, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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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
Perhaps it's unfair of me, but it seems to me that there's a lot of tunnel
  vision in these proposals.
Tunnel vision and navel-gazing are bad strategies, here or elsewhere.
The companies, and researchers trying to produce fuel from algae have tunnel
  vision.
Talk about the selfish tunnel vision of the privileged.
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