Posturographic Analysis in Patients Affected by Central and Peripheral Visual Impairment

Area of Science:

• Neuroscience
• Ophthalmology
• Biomechanics

Background:

• Vision loss is recognized to affect equilibrium, but postural control in low vision remains understudied.
• Understanding how different patterns of vision loss influence postural stability is crucial for rehabilitation.

Purpose of the Study:

• To evaluate postural stability and sensory integration in individuals with central visual impairment (CLV) and peripheral visual impairment (PLV).
• To compare the use of visual, proprioceptive, and vestibular information for postural control in low vision patients versus normal vision controls (NC).

Main Methods:

• Recruited participants with normal vision (NC), central visual impairment (CLV), and peripheral visual impairment (PLV).
• Conducted clinical evaluations, Computed Dynamic Posturography (Sensory Organization Test), and Motor Control Tests (MCT).
• Assessed postural adaptive responses to unexpected disturbances and analyzed sensory contributions (visual, proprioceptive, vestibular).

Main Results:

• CLV and PLV patients showed poorer performance in specific Sensory Organization Test conditions compared to NC.
• CLV patients had significantly lower scores in condition 5 and reduced vestibular contribution, with worse MCT latencies.
• All visually impaired subjects demonstrated reduced visual afferences; somatosensory contribution showed no significant differences.

Conclusions:

• Low vision significantly alters postural control, with distinct adaptive strategies observed in CLV and PLV patients.
• Central visual impairment is associated with specific deficits in vestibular processing and motor control adaptation.
• Findings highlight the need for tailored interventions addressing specific sensory and motor challenges in low vision rehabilitation.