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PARALLACTIC ANGLE

PARALLACTIC ANGLE Abstract To the Editor: —Lieutenant Colonel Byrnes's comments in the December issue of the Archives on my article on the "Parallactic Angle in Binocular Depth Perception" (Arch. Ophth.28: 258 [Aug.] 1942) bring to the fore the want of clearcut definitions of some of the terms used. To start from the beginning, just what is meant by "binocular parallax"? If one consults the two leading medical dictionaries one finds the following definitions : Gould's medical dictionary says, "Binocular parallax is the angle of convergence of the visual axes" ; Dorland's "American Illustrated Medical Dictionary" says "Binocular parallax is the seeming difference in position of an object as seen separately by one eye and then by the other, the head remaining stationary." Different dictionaries are expected to define the same term in somewhat different ways but to convey the same meaning. These two definitions do not convey the same meaning. Furthermore, the term "binocular References 1. Duke-Elder, W. S.: Text-Book of Ophthalmology , St. Louis, C. V Mosby Company, 1933, vol. 1, p. 1077. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

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Publisher
American Medical Association
Copyright
Copyright © 1943 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1943.00880140161016
Publisher site
See Article on Publisher Site

Abstract

Abstract To the Editor: —Lieutenant Colonel Byrnes's comments in the December issue of the Archives on my article on the "Parallactic Angle in Binocular Depth Perception" (Arch. Ophth.28: 258 [Aug.] 1942) bring to the fore the want of clearcut definitions of some of the terms used. To start from the beginning, just what is meant by "binocular parallax"? If one consults the two leading medical dictionaries one finds the following definitions : Gould's medical dictionary says, "Binocular parallax is the angle of convergence of the visual axes" ; Dorland's "American Illustrated Medical Dictionary" says "Binocular parallax is the seeming difference in position of an object as seen separately by one eye and then by the other, the head remaining stationary." Different dictionaries are expected to define the same term in somewhat different ways but to convey the same meaning. These two definitions do not convey the same meaning. Furthermore, the term "binocular References 1. Duke-Elder, W. S.: Text-Book of Ophthalmology , St. Louis, C. V Mosby Company, 1933, vol. 1, p. 1077.

Journal

Archives of OphthalmologyAmerican Medical Association

Published: Feb 1, 1943

References