DVA/GST
 

 

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GST PhotoDynamic Visual Acuity (DVA)

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 (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.
 

 

Key Benefits

  •  Allows greater specificity of assessment
  •  Compares to normative values
  •  Monitors patient progress

Capabilities

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.

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