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Spatial and temporal analyses of posture in strabismic children

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Abstract

Purpose

To analyse postural performances of strabismic children, both in the spatial and the temporal domains, by wavelet transformation, comparing both stable and unstable situations.

Methods

Twenty-six strabismic children aged from 4 to 11 years old and 26 age-matched normal children participated in the study. Postural performances were evaluated using the Framiral® platform. Posture was recorded in the following conditions: eyes open fixating a target and eyes closed on stable and unstable platforms.

Results

For both strabismic and non-strabismic children, the surface and the mean velocity of the center of pressure (CoP) were significantly larger in the eyes closed on unstable platform condition, but this was much more pronounced in case of strabismus. Spectral power index and cancelling time were also found to be altered in strabismic children compared to non-strabismic children.

Conclusions

This data demonstrates poor postural stability for both groups on an unstable platform with the eyes closed. However, strabismic children had significantly worse performance than non-strabismic children. Strabismic children also engage more energy to stabilize their posture by using visuo-vestibular sensory inputs to compensate their altered vision due to strabismus, in comparison to non-strabismic children.

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Acknowledgments

The authors are grateful to the Fondation Cotrel / Institut de France for their financial support.

Cynthia Lions was supported by the Société Francophone de Posture, Equilibre et Locomotion (SOFPEL). The authors thank the parents and children involved in the study for their kind participation, Dr. Liza Vera and Dr. Alexandra Gavard for conducting ophthalmology examinations of the strabismic children, Ms. Nathalie Semsoum for the management of the children’s appointments and Chloe Barker for revising the English version of the manuscript.

Conflict of interest

All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements) or non-financial interest (such as personal or professional relationships, affiliations, knowledge, or beliefs) in the subject matter or materials discussed in this manuscript.

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    Authors and Affiliations

    1. UMR 1141, INSERM - Université Paris 7, Hôpital Robert Debré, 48 boulevard Sérurier, Paris, France

      Marie-Désirée Ezane, Cynthia Lions & Maria Pia Bucci

    2. Service d’Ophtalmologie, Hôpital Robert Debré, 48 Boulevard Sérurier, 75019, Paris, France

      Emmanuel Bui Quoc

    3. Collège de France, Center Interdisciplinary Research in Biology (CIRB), Spatial Memory and Navigation Team, 75005, Paris, France

      Chantal Milleret

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    1. Marie-Désirée Ezane
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    2. Cynthia Lions
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    5. Maria Pia Bucci
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    Corresponding author

    Correspondence to Cynthia Lions.

    Additional information

    Marie-Désirée Ezane and Cynthia Lions contributed equally to this work.

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    Ezane, MD., Lions, C., Bui Quoc, E. et al. Spatial and temporal analyses of posture in strabismic children. Graefes Arch Clin Exp Ophthalmol 253, 1629–1639 (2015). https://doi.org/10.1007/s00417-015-3134-8

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    • DOI: https://doi.org/10.1007/s00417-015-3134-8

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