Ganglion cell and retinal nerve fiber layer analysis in a case of PION

Posterior Ischemic Optic Neuropathy (PION) is a retro bulbar optic nerve ischemia presenting with sudden, painless visual loss with the presence of decreased vision, visual field defect, an afferent pupillary defect, yet the retina and optic nerve appear normal initially. PION can be seen in isolation, as part of giant cell arteritis, or post surgical. A PubMed search does not reveal any cases of OCT in the phases of PION. Ganglion cell OCT can help determine when ganglion cell thinning occurs in ischemic optic neuropathy. A case of PION and OCT is presented.