Electronystagmography (ENG) is a diagnostic test used to assess the function of the vestibular system, which helps control balance and eye movements. During the test, small electrodes are placed around the eyes to measure electrical activity as the eyes move in response to various stimuli, such as changes in head position or visual targets. The results of ENG can help identify issues related to inner ear disorders, vestibular nerve function, or other balance-related problems. This information is valuable for healthcare providers in diagnosing conditions like vertigo or Meniere's disease and determining appropriate treatment options.