correspondence of the visual axes of the two eyes; equality in the tension of the vertical muscles of the two eyes.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
isophoria(ī″sō-fō′rē-ă) [″ + phorein, to carry]
Equal tension of vertical muscles of each eye with visual lines in the same horizontal plane; absence of hyperphoria and hypophoria.
Medical Dictionary, © 2009 Farlex and Partners
Constancy of the heterophoria in various directions of gaze. See heterophoria.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann