What is nystagmus test

If nystagmus is present it will be identified by triangles on the graph to represent each detected nystagmus beat. The average slow phase velocity value s will be plotted in the bar graphs to the right of the tracings. When both a fixation-free and a fixation section have been completed in the spontaneous nystagmus test, a fixation index FI percentage value will also be calculated.

The assessment of spontaneous nystagmus is essential as it affects all other tests within the VNG test battery. The presence of spontaneous nystagmus may be further analyzed as a sign of central versus peripheral vestibular involvement.

Michelle Petrak , Ph. Her primary role is development and clinical validation of new technologies in the vestibular and balance areas. Petrak received her doctorates in Electrophysiology and Biomolecular Electronics from Wayne State University and her Masters in Audiology in Her special areas of expertise include vestibular and balance assessments and management of the dizzy patient. Petrak is involved with new innovative product developments, clinical evaluations of new protocols, and publishing, teaching, and training on the management of patients with dizziness.

She continues to lecture extensively nationally and internationally, and she has numerous articles published in the hearing industry journals.

She also participates on the committees for several doctoral students as support for the research projects. Your eyes are constantly moving to keep track of the objects flying by as the vehicle moves past them. The shaking varies between slow and smooth to short and rapid, while the patient's eyes are focused on a central point.

If there is a lag in tracking, it means a vestibular inner-ear issue is likely present. Current Procedural Terminology CPT codes are a series of numbers assigned to specific medical services and procedures.

The codes are used to identify which services were performed during an office visit and their associated cost. Details of CPT codes are updated annually.

If during this general screening, your eye doctor or physician detects signs of nystagmus, they will likely refer you to a specialist, like a neuro-ophthalmologist. This specialist will conduct more detailed, in-depth testing to establish the type of nystagmus and determine the cause.

A number of tests may be conducted to provide the required information for a diagnosis, each with their own CPT code. The most common nystagmus test CPT codes include:. Nystagmus and horizontal gaze nystagmus can be traced to several different sources, including alcohol use and the consumption of other drugs that depress the central nervous system, such as inhalants or phencyclidine.

During the observation, the officer tries to estimate the angle at which the jerking movements begin. Jerking movements in the eye before the gaze reaches a degree angle is indicative of a possible blood alcohol content level over.