Document Detail

Eye-movement responses to disparity vergence stimuli with artificial monocular scotomas.
MedLine Citation:
PMID:  16769606     Owner:  NLM     Status:  MEDLINE    
The effects of artificial monocular scotomas on eye-movement responses to horizontal disparity vergence stimuli were studied in six subjects with normal binocular vision. Subjects viewed stereoscopic 1.5 degrees horizontal step disparity vergence stimuli through liquid crystal shutter glasses. The central portion of the stimulus presented to the right eye was removed to simulate monocular artificial scotomas of variable diameters (2 degrees to 10 degrees ). Eye movements were recorded with a binocular head-mounted eye tracker. Responses included pure vergence, vergence followed by saccades, and pure saccadic eye movements. The rate of responses with saccadic eye movements increased with the diameter of the artificial scotoma (p < 0.0001); there was an increase in the rate of responses starting with saccades (p < 0.0001), as well as an increase in the rate of saccades after initial vergence responses (p < 0.01). The probability of saccades after initial vergence responses was affected by the open-loop gain of the vergence response (p < 0.001). The open-loop gain decreased with increased diameters of the artificial scotomas (p < 0.0001). As the diameter of the artificial scotomas increased, the amplitude of the initial vergence eye-movement responses decreased, and the prevalence of saccadic eye movements and asymmetric vergence increased. The effects of the diameter of artificial monocular scotomas on eye-movement responses in subjects with normal binocular vision are consistent with the effects of diameter of suppression scotomas on eye-movement responses to disparity vergence stimuli in patients with infantile esotropia.
M Eizenman; R Sapir-Pichhadze; C A Westall; A M Wong; H Lee; Y Morad
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Current eye research     Volume:  31     ISSN:  0271-3683     ISO Abbreviation:  Curr. Eye Res.     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-06-13     Completed Date:  2006-08-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8104312     Medline TA:  Curr Eye Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  471-80     Citation Subset:  IM    
Department of Ophthalmology and Visual Sciences, The Hospital for Sick Children, Toronto, Ontario, Canada.
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MeSH Terms
Convergence, Ocular / physiology
Saccades / physiology*
Scotoma / physiopathology*
Vision Disparity / physiology*
Vision, Monocular / physiology

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