Videonystagmography results are often used to determine the probable side of vestibular weakness. Which item best reflects this purpose?

• A. The degree of hearing loss
• B. The site of vestibular weakness
• C. The presence of tinnitus
• D. The patient's reaction to noise

Answer: (B)

Videonystagmography reveals how the vestibulo-ocular reflex responds to stimulation, letting us see which vestibular apparatus is not functioning properly. By comparing responses from each ear—through tests like caloric irrigation or rotational tests—the eye movement patterns show asymmetry. The side with the weaker response points to the site of vestibular weakness. Hearing loss, tinnitus, or reactions to noise are auditory phenomena and don’t localize vestibular dysfunction, so they don’t indicate the side of vestibular impairment.