The instrument shown below is used in ENT for all except?

Ans. (d) Oculovestibular reflexes.* Impedance audiometry involves performing several measurements to obtain a wide range of information about the middle and inner ear. A probe with a rubber tip and containing three small patent tubes is fitted into the meatus to make an airtight seal. One tube delivers the tone to the ear, a second tube is attached to a microphone to monitor the sound pressure level within the ear canal, and a third tube is attached to a manometer to vary the air pressure in the ear.* Ihe primary purpose of impedance audiometry is to determine the status of the tympanic membrane and middle ear via tympanometry. The secondary purpose of this test is to evaluate acoustic reflex pathways, which include cranial nerves (CN) VII and VIII and the auditory brainstem. This test cannot be used to directly assess auditory sensitivity, although results are interpreted in conjunction with other threshold measures.