Caloric testing is a diagnostic procedure used to assess the function of the vestibular system, which helps control balance and eye movements. During the test, warm or cold water is introduced into the ear canal, stimulating the inner ear. This stimulation causes a response in the nystagmus, or involuntary eye movements, which can be measured to evaluate how well the vestibular system is working. The results of caloric testing can help identify issues such as vestibular disorders or inner ear problems. By comparing the responses from each ear, healthcare providers can determine if there is a dysfunction in one side of the vestibular system, aiding in diagnosis and treatment planning.