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Related Experiment Videos

Postural sway during retinal image stabilisation.

D N Rushton1, T Brandt, W Paulus

  • 1M R C Neurological Prostheses Unit, Institute of Psychiatry, London, UK.

Journal of Neurology, Neurosurgery, and Psychiatry
|March 1, 1989
PubMed
Summary
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This study found that a partial retinal image stabilization (RIS) device can improve balance for specific tasks but worsens it during active head movements. Patients with oscillopsia may benefit from RIS during sedentary activities.

Area of Science:

  • Ophthalmology
  • Neurology
  • Biomechanics

Background:

  • Oscillopsia, often caused by visual disorders, significantly impacts balance and quality of life.
  • Retinal image stabilization (RIS) devices aim to mitigate symptoms by reducing retinal image motion.

Purpose of the Study:

  • To investigate the postural effects of a partial RIS device in normal subjects.
  • To evaluate the device's efficacy under different conditions of visual input and head movement.

Main Methods:

  • Posturography was performed on healthy individuals using a piezoelectric platform.
  • Measurements were taken under conditions of normal vision, eyes closed, and while wearing a partial RIS device.
  • Postural sway was assessed during both rest and active head-and-eye movements.

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Main Results:

  • At rest, the RIS device resulted in intermediate postural sway compared to normal vision and eyes closed.
  • During active head-and-eye movements, the RIS device significantly increased postural sway, exceeding that of the eyes-closed condition.
  • Increased RIS levels correlated with greater postural sway.

Conclusions:

  • Partial RIS devices may benefit patients with oscillopsia during low-movement tasks like reading or watching television.
  • The device's effectiveness is limited during tasks requiring significant head and eye coordination.
  • The partial RIS device serves as a valuable model for understanding the postural impact of oculomotor disorders in healthy individuals.