Physiological nystagmus refers to the involuntary movement of the eyes that occurs in response to certain stimuli. While this phenomenon is typically considered normal and harmless, some people may feel uncomfortable or dizzy when experiencing it. Synonyms for physiological nystagmus include vestibular nystagmus, ocular nystagmus, and reflex nystagmus. Doctors may also refer to this condition as gaze-evoked nystagmus, as the movement of the eyes occurs in response to changes in gaze direction. Other factors that can trigger physiological nystagmus include fatigue, stress, and certain medications. Overall, while this condition may be a bit uncomfortable, it is generally considered benign and should not typically require medical treatment.