Case of acute zonal occult outer retinopathy resembling retrobulbar optic neuropathy

We report a case of acute zonal occult outer retinopathy (AZOOR) with a central scotoma and normal fundus. A 17-year-old man presented with reduced vision in his right eye.A relative afferent pupillary defect was not present, and his fundi were normal. He had a central scotoma in the right eye, but the left eye was normal. Central flicker fusion and color vision were normal in both eyes. Fluorescein angiography showed a somewhat mottled retina in the midperiphery of the right eye. The visually evoked potentials were reduced bilaterally. The a- and b-waves of the photopic ERGs and the amplitude of the flicker ERGs were reduced. In addition, the multifocal electroretinograms (mERGs) were reduced. A diagnosis of AZOOR was made. Electrophysiological studies were helpful in making a diagnosis of AZOOR in this case.