Acoustic/Vestibulocochlear nerve testing
The patient is positioned in sitting in a quiet location. The therapist, positioned behind the patient and to one side, slowly brings a ticking watch toward the patient's ear. The therapist records the distance from the ear when the patient is able to identify the ticking sound. The therapist repeats the procedure on the contralateral ear and compares the measurements. A positive test is indicated by an inability to hear the ticking sound at 18-24 inches or a significant bilateral difference.
Rinne's test - a vibrating tuning fork is placed on the mastoid process (the bony mass just behind the ear), and is then quickly placed around 4cm from the ear hole. The sound should normally be louder next to the ear hole than it is when in contact with the mastoid process, as the bones of the middle ear that amplify sound are bypassed when the sound travels in through the mastoid process. Each ear should be tested independently.
Weber's test - a vibrating tuning fork is placed against the middle of the forehead. The sound should be equally audible in both ears.