The videonystagmography (VNG) examination identifies spontaneous nystagmus, which is horizontal. This nystagmus gets reduced on optic fixation. Video Head Impulse Test (vHIT) shows a deficit in the vestibulo-ocular reflex on the affected side.
The Subjective Visual Vertical (SVV) test shows a misinterpretation of the vertical plane, shifted to the damaged side by more than 10°. Craniocorpography (CCG) will reveal a rotation to the affected side on Unterberger test.
The patient of Vestibular Neuritis may have reduced Dynamic Visual Acuity (DVA).
Audiogram and Impedance Measurements are conducted to make sure there is no cochlear or middle ear impairment.
The neurological examination is normal. Over a few days, the vestibular symptoms subside and the patient may observe lessened sensations of spinning or rotation. The neurovegetative symptoms like nausea & vomiting improve too. However, the feeling of imbalance may remain for some time.
If the vertigo is coupled with unusual headaches and neurological symptoms like slurring of speech, muscle weakness or loss of altered consciousness a brain MRI must be done to rule out any central pathology.