Treatment Study for Ischemic Optic Neuropathy With Opthalmic Timolol Maleate 0.5%

Inclusion Criteria: * Age \>40 * Sudden, painless monocular vision loss with edema of the optic disc * Clinical diagnosis is Non-Arteritic Anterior Ischemic Optic Neuropathy * Relative Afferent Pupil Defect (RAPD) at first study visit Exclusion Criteria: * Onset of vision loss \>48 hours from time of enrollment * History of Asthma or COPD * History of Heart Block or Sinus Bradycardia * Allergy to any beta blocker * History of Multiple Sclerosis or optic neuropathy * Active Ocular Inflammation on examination * Currently being treated for Cancer or systemic vasculitis * History of Glaucoma or use of medications that lower IOP * Symptomatic cataract, retinopathy, macular disease or amblyopia in the symptomatic eye * IOP of \<10 at baseline * Ocular surgery in past three months * Women who are pregnant, breast-feeding or may become pregnant * Inability to provide informed consent or follow up at three months * Currently enrolled in any other study drug trial or previously enrolled in this study