A 34-year-old woman, with preceding flu-like febrile illness, developed acute macular neuroretinopathy in her left eye with typical reddish brown macular lesions and a dense paracentral scotoma. Her condition was evaluated with multifocal electroretinogram and optical coherence tomography in her acute and recovery phases. The findings assist ophthalmologists striving for better understanding and diagnosis of acute macular neuroretinopathy.