Comparison of fixation disparities obtained by objective and subjective methods

Vision Research
N Fogt, R Jones

Abstract

Fixation disparities (FD) were measured as a function of forced vergence using binocular scleral search coils and simultaneously with nonius lines. The slope of the objective FD curve was significantly greater than the subjective FD curve for three of five subjects. This indicates an alteration in retinal correspondence of up to one degree, that shifts Panum's area to avoid the diplopia normally present with large disparities. This process allows for fusion in the presence of large objective fixation disparities which would normally cause diplopia. The shift in correspondence enhances the range of forced vergence, since the larger objective FDs serve as more effective stimuli to fusional vergence. The remaining subjects who lacked this effect had "flat" FD curves indicative of high vergence adaptation.

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Citations

Aug 28, 1999·The Journal of Comparative Neurology·E L Fletcher, H Wässle
May 26, 1999·Vision Research·W JaschinskiB Griefahn
Jan 24, 2007·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Wolfgang JaschinskiNina Walper
Feb 25, 2009·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·S JaintaW Jaschinski
Sep 11, 2012·PloS One·Marc GrosjeanStephanie Jainta
Jan 22, 2003·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Miriam KromeierGuntram Kommerell
Feb 2, 2000·Optometry and Vision Science : Official Publication of the American Academy of Optometry·J R JiménezL J del Barco
Jul 6, 2000·Optometry and Vision Science : Official Publication of the American Academy of Optometry·M T Ukwade
Nov 25, 2003·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Elaine D CornellIan S Curthoys
Dec 1, 2005·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Wolfgang JaschinskiJulia Buchholz
Oct 17, 1998·Vision Research·N Fogt, R Jones
Oct 26, 2007·Vision Research·S JaintaW Jaschinski
Aug 3, 2001·Vision Research·J M Hillis, M S Banks
Jan 22, 2003·Vision Research·Michael T UkwadeRonald S Harwerth
Jun 25, 2010·Vision Research·Stephanie JaintaWolfgang Jaschinski
Oct 3, 2015·PloS One·Volkhard SchrothWolfgang Jaschinski
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Aug 25, 2018·Journal of Healthcare Engineering·Laura CercenelliEmanuela Marcelli
Aug 25, 2020·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Kevin T WillefordAlina Sample
Dec 29, 2020·Vision Research·Jian Ding, Dennis M Levi
Apr 20, 2005·Behavioural Brain Research·Patricia M Cisarik, Ronald S Harwerth

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