The saccade test is a crucial component of videonystagmography (VNG), which assesses the central vestibular system. Here are the key points:
Purpose: The saccade test evaluates the patient’s ability to move their eyes rapidly between focal points. Unlike voluntary eye movements, saccades are reflexive.
Abnormalities: The test assesses the velocity, accuracy, and latency of saccades. Abnormalities may include:
Velocity: Eye movements that are either too slow or too fast.
Accuracy: Overshooting or undershooting the target.
Latency: Reaction time, usually long latency (short latencies may result from patient anticipation).
Site of Lesion: The results can provide specific information about the site of the lesion.
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