line of vision

noun Ophthalmology.
a straight line that connects the fovea centralis of an eye with the point on which the eye focuses. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
line of vision
ophthalmol Also called: line of sight a straight line extending from the fovea centralis of the eye to an object on which the eye is focused

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The professor asked me to sit in the back of the room, out of their line of
  vision, and not to speak.
The shot must have been taken around midday, since the sun was shining into our
  line of vision.
Always keep the shore or the boat within your line of vision.
When one of us spoke near his ear but out of his line of vision, he turned
  toward the voice.
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