What is the vestibulo-ocular reflex?

In daily life, stress from work and lifestyle can cause ocular discomfort. It is often said that such discomfort can be assessed via the vestibulo-ocular reflex (VOR). But what exactly is the vestibulo-ocular reflex?

What Is the Vestibulo-Ocular Reflex?

The vestibulo-ocular reflex (VOR) is a clinical test used to evaluate the function of the vestibulo-oculomotor neural system. Neural reflexes—including the VOR itself and vestibulo-visual interaction (VVI)—are essential for maintaining stable dynamic vision. Visual acuity changes are measured using the logMeanAngleResolvable method, which directly and sensitively reflects the functional status of the human vestibulo-oculomotor system, retinal stability, and dynamic visual capability. The vestibulo-oculomotor reflex test involves positioning the patient with the head elevated 30 degrees and irrigating the tympanic membrane with 50 mL of ice-cold saline or water.

The vestibulo-ocular reflex is absent in brain death; no nystagmus or deviation of the eyes occurs following auditory stimulation. After each ear stimulation, the patient should be observed for one minute, and a five-minute interval should be allowed between successive ear examinations. Certain medications may suppress the VOR, including sedatives, aminoglycosides, tricyclic antidepressants, anticholinergics, and antiepileptic drugs. Facial trauma involving the external auditory canal or petrous bone may also inhibit this reflex.

Maintain healthy lifestyle habits—avoid frequent late-night activity and ensure adequate sleep. We hope this explanation has been helpful!