Extended Version - Examination and Localization of Eye Movement Disorders

This epiode is an extended version of the recently published episode on the examination and localization of eye movement disorders. The orginal paper details a comprehensive clinical framework for the examination and localization of eye movement disorders, emphasizing that the systematic bedside assessment serves as the primary tool for anatomical diagnosis. By distinguishing between supranuclear, nuclear, and infranuclear lesions, clinicians can categorize ocular motor dysfunction based on how specific eye movements, such as saccades or the vestibulo-ocular reflex, are impacted. The sources outline essential quantitative bedside tools—including prism cover tests and the HINTS battery—to differentiate between vascular, inflammatory, and degenerative causes. Detailed profiles of various conditions are provided, ranging from cranial nerve palsies and brainstem stroke syndromes to complex neuromuscular junction disorders like myasthenia gravis. Ultimately, the text illustrates how specific findings, such as pupillary involvement or fatigability, help narrow a wide differential into a precise neurological or structural diagnosis. This episode is based on a paper written exclusively for the Weekly Neurology Deep Dive Podcast by Amer A. Ghavanini MD PhD FRCPC.