The frequency of horizontal saccades in near and far symmetrical disparity vergence

Vision Research
Eun H Kim, T L Alvarez

Abstract

In a natural environment, saccade and vergence eye movements shift gaze in different directions and distances. In a laboratory setting, targets can be positioned precisely to elicit symmetrical vergence movements; however, saccades occur during the vergence movement even though the stimulus should not stimulate a saccadic response. These saccades may facilitate the response when the kinematics of the vergence component are modest as indicated by reduced velocities. Hence, the purpose of this study is to assess whether the frequency of saccades within vergence responses are correlated with vergence peak velocity. Ten subjects with normal binocular vision participated in this study. Eye movements were quantified using a limbus tracking system. Stimuli included 4° symmetrical convergence and divergence steps with an initial vergence angle at far (2° and 6°, respectively) and near (12° and 16°, respectively) which are known to evoke different vergence peak velocities. A saccade detecting algorithm was utilized to compute the percentage of saccades present within all vergence responses. A repeated measures ANOVA confirmed with a post hoc Bonferroni test demonstrated that convergence steps at near were slower than convergence steps a...Continue Reading

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Citations

Sep 11, 2012·PloS One·Marc GrosjeanStephanie Jainta
Feb 14, 2017·Vision Research·Tara L AlvarezBérangère Granger-Donetti
Jul 29, 2016·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Mitchell M ScheimanTara L Alvarez
Dec 21, 2018·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Mitchell ScheimanTara L Alvarez
Jun 9, 2020·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Mashael NamaehTara L Alvarez
Jun 2, 2017·Scientific Reports·Tara L AlvarezBérangère Granger-Donetti
Mar 5, 2019·Journal of Neurotrauma·Chang YaramothuTara L Alvarez
Jul 22, 2018·Journal of Vision·Chang YaramothuTara L Alvarez
Jun 21, 2021·Vision Research·Clara MestreJosselin Gautier

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