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Gaze Stabilization & Oculomotor Assessment Flashcards

7 cards from real CVT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Dynamic visual acuity (DVA) testing measures:

    Answer: The change in visual acuity between static conditions and during active head movement

    DVA measures the difference in visual acuity between static conditions and during active head movement, directly reflecting the functional adequacy of VOR-mediated gaze stabilization.

  2. Normal VOR gain during sinusoidal rotational chair testing is approximately:

    Answer: 0.8–1.0

    Normal VOR gain is approximately 0.8–1.0, indicating that eye velocity closely matches head velocity and gaze is maintained on the target.

  3. Covert saccades detected on vHIT are best described as:

    Answer: Saccades that occur during the head impulse before the head stops moving

    Covert saccades occur during the head impulse itself while the head is still moving; they represent an early compensatory strategy invisible to the naked eye and detectable only by video.

  4. The smooth pursuit eye movement system is best tested at which frequency range?

    Answer: 0.5–2 Hz

    Smooth pursuit is most effectively assessed at 0.5–2 Hz; higher frequencies exceed the bandwidth of the smooth pursuit system and require saccadic catch-up movements.

  5. Which oculomotor finding most strongly suggests a central vestibular lesion rather than a peripheral one?

    Answer: Direction-changing nystagmus that reverses with the direction of gaze

    Direction-changing gaze-evoked nystagmus — beating toward the direction of gaze — is a hallmark of central vestibular pathology, typically involving cerebellar dysfunction.

  6. The optokinetic nystagmus (OKN) response is generated by which combination of eye movement systems?

    Answer: Both smooth pursuit and saccadic systems working together

    OKN involves the smooth pursuit system to track the moving visual field (slow phase) and the saccadic system to reset the eyes (fast phase), creating the characteristic saw-tooth nystagmus pattern.

  7. During fixation suppression of the VOR (VVOR), failure to suppress the VOR suggests:

    Answer: Cerebellar or central nervous system pathology

    The cerebellum mediates VOR suppression during fixation; failure to suppress the VOR during VVOR testing is a sign of cerebellar or CNS pathology.