peripheral vision

noun
all that is visible to the eye outside the central area of focus; side vision.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  peripheral vision
Part of Speech:  n
Definition:  the capacity to see side or fringe areas when one is looking ahead; one's vision using only the outer edges of one's retina
Dictionary.com's 21st Century Lexicon
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American Heritage
Medical Dictionary

peripheral vision n.
vision produced by light rays falling on areas of the retina beyond the macula. Also called indirect vision.

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
They confirmed that the part of the auditory cortex that picks up peripheral
  sound switches to peripheral vision.
Viewing the image with your peripheral vision makes the motion appear more
  pronounced.
Several posts remark that they have seen things in peripheral vision.
In addition to their excellent visual acuity, turkeys also have awesome
  peripheral vision.
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