Operating Modes The study will be divided into 4 phases: Step 1: establishment of the network: identification of specialized facilities (ophthalmic emergency care and thrombosis centers), which may accept patients with suspected RVO, which will participate in the establishment of the register online; Step 2: Create the registry and recruitment of patients cohort; Step 3: Follow-up planned (1 month) for instrumental tests to confirm the diagnosis of RVO; Step 4: Observational follow-up supported by dedicated web platform for the identification of major adverse cardiovascular events, in order to export in the context of clinical acquisitions epidemiological and disease management in real time.