The patient database in the Dresden University Eye Hospital was reviewed for billing codes of CRAO and BRAO according to the International Classification of Diseases, 10th Revision between September 2010 and December 2016. Patients included in this study had to meet several criteria. First, the patients had to be diagnosed with acute CRAO or BRAO. BRAO was defined as an occlusion of one of the branches of central retinal artery. It should have affected at least in part paramacular regions central of the retinal vessel arcades, but no more than half of the retina. Second, there had to be vision loss or a defect in the visual field occurring within 7 days of the initial visit. Third, the patient must have had SD-OCT at the initial visit. Fourth, the OCT image quality score had to be >30. Patients with a history of ocular trauma or presence of macular disease, severe nonproliferative or proliferative diabetic retinopathy, other retinal vascular diseases, glaucoma, myopic retinopathy, or other diseases interfering with OCT images in any one of the eyes (e.g., vitreomacular traction, epiretinal membrane) as well as one-eyed patients were excluded from the analysis. The contralateral eye of the patients was chosen as the control eye to provide the best match regarding age, sex, and concomitant diseases (such as coronary artery diseases or arterial hypertension), which might affect the retinal vessel situation.