CPT® Code 92534

An optokinetic nystagmus (OKN) test is a specialized diagnostic procedure used to assess the function of the visual and vestibular systems. During this test, the patient is positioned in front of a rotating drum that features alternating black and white vertical stripes. The patient is instructed not to focus on any single stripe, allowing for a natural response of the eyes to the moving patterns. The physician closely observes the eye movements, noting how the eyes react to the rotation of the drum. This observation is crucial as the test aims to elicit eye movements that mimic nystagmus, which is an involuntary eye movement characterized by a rhythmic oscillation. The procedure involves reversing the direction of the drum's rotation and repeating the test to evaluate the consistency and symmetry of the eye movements. A symmetrical response typically indicates normal function, while an asymmetrical response may suggest potential issues within the central nervous system, warranting further investigation. The physician is responsible for analyzing and interpreting the results of the OKN test, which can provide valuable insights into the patient's neurological status and visual processing capabilities.