During an examination, the nurse notices severe nystagmus in both eyes of a patient. Which conclusion by the nurse is correct? Severe nystagmus in both eyes:

A. Severe nystagmus is often associated with neurological disorders, particularly those affecting the cerebellum or brainstem. B. is a sign that the patient is nervous about the examination. Nervousness typically doesn’t cause severe, persistent nystagmus. C. Indicates a visual problem, and a referral to an ophthalmologist is indicated. While nystagmus affects vision, it is usually neurologically based, requiring a neurological assessment rather than a referral to an ophthalmologist. D. Nystagmus is not typically normal, especially when it is severe and persistent. It warrants further investigation.