Monocular components of the fixation disparity curve

• Published in: Optometry and vision science Vol. 68; no. 2; pp. 117 - 126
• Main Authors: LEE IRVING, E, MURRAY ROBERTSON, K
• Format: Journal Article
• Language: English
• Published: Hagerstown, MD Lippincott Williams & Wilkins 01-02-1991
• Subjects: Adult; Biological and medical sciences; Eye and associated structures. Visual pathways and centers. Vision; Female; Fundamental and applied biological sciences. Psychology; Humans; Male; Vertebrates: nervous system and sense organs; Vision Disparity - physiology; Vision, Binocular - physiology; Vision, Monocular - physiology; Human; Eye; Visual system; Visual fixation; Vision; Perception; Disparity
• ISSN: 1040-5488; 1538-9235
• DOI: 10.1097/00006324-199102000-00006

Experiments were conducted to characterize the distribution of the monocular components of fixation disparity, i.e., ascertain whether or not the fixation disparity measured by nonius alignments is equally divided between the two eyes or has an unequal distribution. Computer generated nonius lines were used to measure the monocular components of the forced vergence fixation disparity curve (FDC) for subjects with normal binocularity. Thirty-three percent of all subjects tested showed unequal distribution of their monocular components. The composite FDC's for subjects with unequal distribution of the monocular components tended to have steeper slopes than those with equally distributed components. It was concluded that equally divided monocular components are not a prerequisite for good binocularity.