NeuroCom International

inVision™

Description
Components
System Requirements

Description

The inVision™ package from NeuroCom® quantifies a patient's ability to maintain visual acuity and stable gaze while actively moving the head. The inVision™ package includes:

  • Dynamic Visual Acuity (DVA) Test
    Quantifies the impact of vestibular ocular reflex (VOR) system impairment on a patient's ability to perceive objects accurately while moving the head at a given velocity on a given axis.
  • Gaze Stabilization Test (GST)
    Quantifies the range of head movement velocities on a given axis over which a patient is able to maintain an acceptable level of visual acuity.

Effective image stabilization during head movement (at velocities up to 120 degrees per second), is a key factor in performing activities of daily living. This process can be severely impacted by vestibular deficits with the ability to stabilize gaze and maintain visual acuity decreasing as the severity of a vestibular deficit increases. Image stabilization deficits are usually greater when a patient is moving the head toward the more severely impaired ear, particularly in the presence of a unilateral peripheral loss. The assessment of a patient's ability to perform visual tasks requiring image stabilization is considered complementary to physiological tests of the VOR system.

Dynamic Visual Acuity (DVA) Test Gaze Stabilization Test (GST)
  • Quantifies the extent of visual acuity loss due to the combined influences of underlying vestibular pathology and adaptive responses on image stabilization.
  • Provides information relative to the probable side of lesion in a patient with a suspected unilateral peripheral vestibular deficit. An approach complementary to nystagmography.
  • Helps clinicians identify those patients most likely to benefit from vestibular rehabilitation and to focus rehabilitation exercises accordingly.
  • As a direct indication of impairment, the DVA is an excellent objective measure of the outcome of vestibular rehabilitation.
  • Provides impairment information specific to the direction and velocity of head movements impacting gaze stabilization.
  • Quantifies the velocity range over which VOR compensation is effective for a given head movement.
  • Helps target treatment by demonstrating the specific direction(s) and velocity of head movements most likely to achieve the maximum benefit.
  • Aids in determining disability ratings by comparing the head movements over which gaze stabilization can be maintained relative to movements required by the daily life task.

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GST Photo

Components

An InterSense Inertia Cube 2, 3-axis, integrating gyro mounted on a comfortable headband is used to monitor the velocity and direction of head movements.

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Minimum System Requirements

The inVision™ package is available as an option on NeuroCom systems running Version 8 and higher. For accurate stimulus presentation, the NeuroCom system must be configured with the following:

  • LCD monitor
  • Cart with swing-arm monitor mounting
  • WIN2000 operating system, or later

Earlier versions of NeuroCom systems can be upgraded to accommodate the inVision package. For additional information regarding upgrading your existing NeuroCom System, please contact us.

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