all that is visible to the eye outside the central area of focus; side vision.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Vision produced by light rays falling on areas of the retina beyond the macula.indirect vision
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.