Open AccessTarget eccentricity and form influences disparity vergence eye movements responses: A temporal and dynamic analysis
Author(s) -
Chang Yaramothu,
Rajbir Jaswal,
Tara L. Alvarez
Publication year - 2019
Publication title -
journal of eye movement research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 20
ISSN - 1995-8692
DOI - 10.16910/jemr.12.4.7
Subject(s) - foveal , eye movement , stimulus (psychology) , vergence (optics) , psychology , computer vision , audiology , artificial intelligence , computer science , medicine , neuroscience , ophthalmology , cognitive psychology , retinal
This study sought to investigate whether stimulation to the fovea or the parafovea with different color combinations influenced the temporal and dynamic features of 4° disparity vergence step responses. Twelve unique types of stimuli were displayed within a haploscope presented along the participant’s midsagittal plane. Vergence eye movement responses from fifteen naïve participants were recorded using video-based infrared eye tracking instrumentation. Latency and peak velocity from left and right eye movement responses were quantified. Results show that the type of stimulus projection (foveal versus parafoveal) significantly ( p <0.001) influences the vergence response latency but did not impact peak velocity. Vergence responses to eccentric circles with 6° eccentricity targeting the parafovea resulted in a significantly faster response latency compared to vergence responses to a cross with 2° eccentricity stimuli targeting the fovea. Results have implications for the stimulus design of a variety of applications from virtual reality to vision therapy interventions.