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Clin Neurophysiol. 2008 Oct;119(10):2314-20. doi: 10.1016/j.clinph.2008.06.016. Epub 2008 Aug 28.

Vertical phoria and postural control in upright stance in healthy young subjects.

Author information

1
IRIS Group CNRS/FRE 3154: Service d'Ophtalmologie, Hôpital Européen Georges Pompidou, 20 rue Leblanc, 75908 Paris Cedex 15, France. matheron@wanadoo.fr

Abstract

OBJECTIVE:

To test the quality of postural performance in quiet upright stance in healthy young adults with vertical heterophoria (VH) within the normal range and without VH (vertical orthophoria, VO).

METHODS:

Twenty-six subjects took part in this study. The postural stability was measured with a force platform while the subjects fixated a target at eye level in a straight ahead position, placed at either 40 or 200cm.

RESULTS:

The results indicated that the postural control was better for subjects with VO than subjects with VH. Particularly, there was an interaction between vertical phoria and distance: the subjects with VH showed greater instability than the subjects with VO at a far distance only. An additional study showed that the cancellation of VH with a prism improved postural stability.

CONCLUSIONS:

The quality of postural performance in quiet upright stance was lower in the subjects with VH. We speculate that VH, even when small in size, indicates a perturbation of the somatosensory/proprioceptive loops involved in postural control.

SIGNIFICANCE:

Vertical phoria could perhaps indicate the capacity of the central nervous system to integrate optimally proprioceptive cues.

PMID:
18760665
DOI:
10.1016/j.clinph.2008.06.016
[Indexed for MEDLINE]

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