Alterations of Retinal Pigment Epithelium–Photoreceptor Complex in Patients with Type 2 Diabetes Mellitus without Diabetic Retinopathy: A Cross-Sectional Study

Figure 1

Three concentric circles of 1, 3, and 6 mm diameter with the center of the macular fovea and nine Early Treatment Diabetic Retinopathy Study areas. 1, foveal area; 2, paracentral area; and 3, peripheral area.