Macular Involvement in Diabetic Retinopathy Evaluated With Swept-Source OCT

Inclusion Criteria: * Age ≥18 Participants can have 1 or 2 study eyes Patient Group: * Diabetes mellitus type 1 or 2 * Study eye with any DR severity level: no DR, mild NPDR, mod NPDR, sev NPDR, PDR Exclusion Criteria: * Substantial media opacities that would preclude successful imaging * Active intraocular inflammation (grade trace or above) in either eye like infectious conjunctivitis, keratitis, scleritis, endophthalmitis as well as idiopathic or autoimmune-associated uveitis in either eye * Structural damage to the center of macula in the study eye * History of prior panretinal photocoagulation * History of treatment with intravitreal agents over the prior 6 months * Macular edema involving the central subfield * Prior history of vitrectomy * Atrophy of retinal pigment epithelium, subretinal fibrosis, laser scar within foveal avascular zone (FAZ) or organized hard exudate plaques * Substantial non-diabetic intraocular pathology in the study eye including retinal vascular occlusion, retinal detachment, macular hole, choroidal neovascularization, macula dystrophies * Intraocular surgery (including cataract surgery, YAG laser capsulotomy) in the study eye within 3 months preceding Day 0, or history of corneal transplantation in the study eye * Uncontrolled glaucoma in the study eye (defined as intraocular pressure ≥ 25 mmHg despite treatment with anti-glaucoma medication)or history of glaucoma filtration surgery * Inability to obtain fundus images of sufficient quality to be analyzed and graded