2 Most modern labs follow a more or less similar protocol. While most authors discuss rotation tests separately from ENG, a few include rotation testing within their definition of the ENG battery. My description of a standard core balance testing battery draws heavily from work done by Shepard and Telian. 4 Rotation or postural platform testing is added when appropriate. This looks for possible dysconjugate eye movements.
Higher frequencies stress the system to bring out subtle abnormalities.
Pursuit capabilities degrade with aging. Eccentric gaze tests are performed with rebound back to center position. If gaze nystagmus is seen in eccentric positions, nystagmus reversal upon rebound increases the suspicion of a central lesion. 4 Foveal optokinetic testing should be considered a cross-check of pursuit tracking. If tracking is within age norms, a foveal optokinetic abnormality would be ignored.