Figure 1: Different patterns of diabetic macular edema (DME), as represented on optical coherence tomography (OCT) images. The four types of DME were categorized as (A) diffuse retinal thickening (SDRT), which appeared as sponge-like retinal swelling,(B) cystoid macular edema (CME) which had intraretinal cystoid spaces, (C) serous retinal detachment (SRD) which had serous elevation of the retina with a clear space between the retina and the retinal pigment epithelium, and (D) combination DME, which presented as a combination of CME and SRD.