Fig. 1From: Resistive index of ophthalmic artery correlates with retinal pigment epithelial alterations on spectral domain optical coherence tomography in diabetic retinopathySingle layer retinal pigment epithelial maps showing retinal pigment epithelial topographic alterations in diabetic retinopathy alterations of this layer was graded into 3 categories: a Grade 0: No RPE alterations, b Grade 1: focal- alteration in predominantly up to 2 quadrants of map, c Grade 2: global- alteration in more than 2 quadrants of mapBack to article page