• In the study of 50 patients with unilateral central retinal vein occlusion, abnormal electroretinograms were observed in the fellow eyes of 18 patients (36%). The abnormal electroretinograms were super-normal in 15 patients (30%) and negative (+) in the fellow eyes of 3 patients (6%). The amplitudes of a and b waves were significantly greater in the fellow eye than those in normal controls. During a 1- to 9-year follow-up, central retinal vein occlusion developed in three fellow eyes (6%). The abnormal electroretinograms in the fellow eyes reflected such factors as circulatory disturbance of the retina that might have led to central retinal vein occlusion in the affected eye.
Sakaue H, Katsumi O, Hirose T. Electroretinographic Findings in Fellow Eyes of Patients With Central Retinal Vein Occlusion. Arch Ophthalmol. 1989;107(10):1459-1462. doi:10.1001/archopht.1989.01070020533033