Final answer:
The Romberg test is used by health practitioners to evaluate a patient's ability to maintain equilibrium without visual stimulus.
Step-by-step explanation:
The test that health practitioners use to evaluate a patient's vestibular apparatus's ability to maintain equilibrium without visual stimulus is called the Romberg test. During this test, the patient is asked to stand straight with feet together and then close their eyes. This eliminates visual feedback, forcing the patient to rely on proprioceptive stimuli from joint and muscle position, as well as information from the inner ear, to maintain balance. The Romberg test can indicate deficits in proprioception and problems with proprioceptive projections to the cerebellum.