Giant cell arteritis (GCA), is one of the few ocular emergencies optometrists are taught to beware of due to the risk of sudden, irreversible vision loss which may become bilateral. Although most optometrist are familiar with the risk of A-AION, GCA may masquerade in a myriad of less typical presentations. This case based course aims to provide a comprehensive overview of the disease entity to provide insight into ordering and interpretation of relevant diagnostic testing