A combination of increasing longevity and increasing obesity is causing a rise in the incidence of diabetes and its associated complications such as diabetic retinopathy. Almost all patients with type 1 diabetes mellitus (DM) develop some signs of retinopathy and approximately 60% of patients with type 2 DM develop diabetic retinopathy. Of those with type 2 DM, diabetic macular oedema (DME) is the most common cause of reduced visual acuity. [1]