Document Detail

Accommodation and vergence require effort-to-see.
MedLine Citation:
PMID:  12808408     Owner:  NLM     Status:  MEDLINE    
PURPOSE: Accommodation and vergence both appear to be influenced by multiple nonsensory factors. "Effort-to-see" is one of these factors. This study was designed to assess the extent to which effort-to-see affects accommodation and vergence. METHOD: Nine volunteers participated in this study. Stimuli were chosen to stimulate selectively either accommodation or vergence. Accommodation and vergence responses were measured while observers viewed each stimulus with the instruction of "concentrate" or "space-out." RESULTS: Both oculomotor adjustments were accurate when observers "concentrated," but regressed toward the resting posture during identical stimulus conditions when observers spaced-out. Interesting, individual differences in oculomotor behavior were apparent. CONCLUSION: This study demonstrates that higher-level attentional factors play an important role in accommodation and vergence for active exploration of the three-dimensional environment.
Ellie L Francis; Bai-chuan Jiang; D Alfred Owens; Richard A Tyrrell
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Optometry and vision science : official publication of the American Academy of Optometry     Volume:  80     ISSN:  1040-5488     ISO Abbreviation:  Optom Vis Sci     Publication Date:  2003 Jun 
Date Detail:
Created Date:  2003-06-16     Completed Date:  2003-07-21     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8904931     Medline TA:  Optom Vis Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  467-73     Citation Subset:  IM    
Division of Ophthalmology, Children's Hospital of Philadelphia, Philadelphia, PA, USA.
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MeSH Terms
Accommodation, Ocular / physiology*
Attention / physiology
Convergence, Ocular / physiology*
Eye Movements / physiology
Visual Perception / physiology*
Grant Support

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