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Spatial and temporal analyses of posture in strabismic children
Marie-Désirée Ezane1, Cynthia Lions2, Emmanuel Bui Quoc3
1UMR 1141, INSERM - Université Paris 7, Hôpital Robert Debré, 48 boulevard Sérurier, Paris, France.
Summary
Strabismic children exhibit poorer postural stability, especially on unstable surfaces with eyes closed. They utilize more energy, relying on visual-vestibular input to compensate for vision deficits.
Area of Science:
- Ophthalmology
- Neurology
- Biomechanics
Background:
- Strabismus, a common visual disorder, can impact motor control and balance.
- Postural stability relies on complex sensory integration, including visual, vestibular, and proprioceptive inputs.
Purpose of the Study:
- To analyze the spatial and temporal domains of postural control in strabismic children using wavelet transformation.
- To compare postural performance in stable and unstable conditions between strabismic and non-strabismic children.
Main Methods:
- Wavelet transformation analysis of postural sway.
- Evaluation of 26 strabismic and 26 control children (4-11 years) on a force platform.
- Testing under eyes open (target fixation) and eyes closed conditions on stable and unstable surfaces.
Main Results:
- Both groups showed reduced stability on unstable platforms with eyes closed, more significantly in strabismic children.
- Center of pressure (CoP) velocity and surface area increased notably in strabismic children under challenging conditions.
- Spectral power index and cancelling time were altered in strabismic children, indicating different postural control strategies.
Conclusions:
- Strabismic children demonstrate significantly impaired postural stability compared to their non-strabismic peers.
- Strabismic children expend more energy to maintain balance, likely by enhancing visuo-vestibular sensory processing to compensate for visual deficits.
- Findings highlight the impact of strabismus on sensorimotor integration and balance.
