At the conclusion of these talks, learners should be able to define potentially life threatening etiologies for double vision including the differential diagnosis of acute bilateral ophthalmoplegia in the emergency room (BMW CAR: brainstem, botulism, Bickerstaff encephalitis, Miller Fisher variant of Guillain Barre, Wernicke, cavernous sinus, and carcinomatous meningitis). In part two of the lecture, the learner should be able to differentiate common causes of acute optic neuritis: the good, the bad, and the ugly.