Document Detail


Postural control in non-amblyopic children with early-onset strabismus.
MedLine Citation:
PMID:  23150621     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: In healthy subjects, the postural stability in orthostatic position is better when fixating at near than at far: increase in the convergence angle contributes to this effect. Strabismus children present a deficit in vergence. This study evaluated postural control in children with respect to the vergence angle as they fixated at different depths thereby engaging in active vergence movements. METHODS: A TechnoConcept platform was used to record the postural stability of 11 subjects (mean age 11.18 ± 4.02 years) with convergent strabismus and 12 (mean age 11.31 ± 3.54 years) with divergent strabismus in 3 conditions: fixation at 40cm, at 2m and active vergence movements between 20cm and 50cm. RESULTS: The medio-lateral body sway decreased significantly with proximity for convergent strabismus (from 3.78 to 2.70 mm) but increased significantly for divergent strabismus (from 3.27 to 3.97). Relative to fixation, vergence eye movements resulted in a statistically significant increase in medio-lateral body sway for convergent strabismus (3.55 vs 2.70) and a decrease for divergent strabismus (3.11 vs 3.97), (p=0.047). Vergence eye movements were associated with the least variance of speed (99 mm²/s² for convergent and 117 for divergent strabismus), so less energy was required in order to control body sway. CONCLUSION: The fixation depth at which postural stability is best is proximal for convergent strabismus and distal for divergent strabismus. Optimal postural stability might be mediated by preponderant eye movement signals related to the angle of strabismus. Reduction of variance of speed in the active vergence condition corroborates our hypothesis.
Authors:
Chrystal Gaertner; Charlotte Creux; Marie-Andrée Espinasse-Berrod; Christophe Orssaud; Jean-Louis Dufier; Zoi Kapoula
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-13
Journal Detail:
Title:  Investigative ophthalmology & visual science     Volume:  -     ISSN:  1552-5783     ISO Abbreviation:  Invest. Ophthalmol. Vis. Sci.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7703701     Medline TA:  Invest Ophthalmol Vis Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Service d'Ophtalmologie, IRIS Group - CNRS, Hopital Europeen Georges Pompidou, 20 rue Leblanc, Paris, Cedex 15, 75908, France.
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