Critical Visual Symptoms You Should Never Ignore

6. New Onset of Double Vision The sudden development of double vision (diplopia) requires a thorough neurological and ocular evaluation. Specialists distinguish between monocular and binocular double vision; if the doubling disappears when one eye is closed, it suggests a misalignment of the eyes often rooted in neurological issues. True double vision can be a symptom of cranial nerve palsy, brain tumors, aneurysms, or autoimmune conditions like Myasthenia Gravis. Additionally, uncontrolled blood pressure and diabetes are common systemic causes that need to be addressed by a physician.