Editors' Pick Effect of 4-aminopyridine on vision in multiple sclerosis patients with optic neuropathy. Horton L, Conger A, Conger D, Remington G, Frohman T, Frohman E, Greenberg B Neurology. 2013 Apr 24. Epub 1969 Dec 31. PMID: 23616154. Abstract CommentRecommendBookmarkWatch