Document Detail


Short-term adaptation of accommodation, accommodative vergence and disparity vergence facility.
MedLine Citation:
PMID:  22480879     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Previous studies have found that subjects can increase the velocity of accommodation using visual exercises such as pencil push ups, flippers, Brock strings and the like and myriad papers have shown improvement in accommodation facility (speed) and sufficiency (amplitude) using subjective tests following vision training but few have objectively measured accommodation before and after training in either normal subjects or in patients diagnosed with accommodative infacility (abnormally slow dynamics). Accommodation is driven either directly by blur or indirectly by way of neural crosslinks from the vergence system. Until now, no study has objectively measured both accommodation and accommodative-vergence before and after vision training and the role vergence might play in modifying the speed of accommodation. In the present study, accommodation and accommodative-vergence were measured with a Purkinje Eye Tracker/optometer before and after normal subjects trained in a flipper-like task in which the stimulus stepped between 0 and 2.5 diopters and back for over 200 cycles. Most subjects increased their speed of accommodation as well as their speed of accommodative vergence. Accommodative vergence led the accommodation response by approximately 77 ms before training and 100 ms after training and the vergence lead was most prominent in subjects with high accommodation and vergence velocities and the vergence leads tended to increase in conjunction with increases in accommodation velocity. We surmise that volitional vergence may help increase accommodation velocity by way of vergence-accommodation cross links.
Authors:
James Maxwell; Jianliang Tong; Clifton M Schor
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2012-03-29
Journal Detail:
Title:  Vision research     Volume:  62     ISSN:  1878-5646     ISO Abbreviation:  Vision Res.     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-05-28     Completed Date:  2012-08-02     Revised Date:  2014-09-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  93-101     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
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MeSH Terms
Descriptor/Qualifier:
Accommodation, Ocular / physiology*
Adult
Convergence, Ocular / physiology*
Eye Movements / physiology
Female
Humans
Male
Photic Stimulation / methods
Reaction Time / physiology
Vision Disparity / physiology*
Young Adult
Grant Support
ID/Acronym/Agency:
EY017678/EY/NEI NIH HHS; R01 EY017678/EY/NEI NIH HHS; R01 EY017678-05/EY/NEI NIH HHS
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