Updated the link to Dr. Hain in the
following section on the Diagnosis Page:
Electronystagmography (ENG) (caloric stimulation test). Vertigo is induced by warm
or cold water or air introduced into the outer ear; the patient's eye
movements (called "nystagmus") are then observed to the extent that
they occur.
Videonystagmography (VNG).
VNG is similar to ENG (above), except that eye movements are studied
with cameras that are incorporated into goggles; a video recording is
made of the eye movements.