Study of the Intravitreal Plasma Kallikrein Inhibitor, KVD001, in Subjects With Center-involving Diabetic Macular Edema (ciDME)

Inclusion Criteria: * Confirmed diagnosis of Type I or Type II diabetes mellitus (DM). * BCVA of ≥19 letters (\~20/400) and ≤73 letters (\~20/40) in the study eye and ≥34 letters(\~20/200 or better) in the fellow eye. * Presence of ciDME in the study eye defined as CST ≥305 μm in women and ≥320 μm in men * Subjects first anti-VEGF injection in the study eye occurred ≤36 months. * Subjects have received at least 3 anti-vascular endothelial growth factor (VEGF) injections in the study eye within a 6-month period. * The last anti-VEGF injection in the study eye is ≥ 8 weeks. Exclusion Criteria: * Evidence of ocular pathology (e.g. visually significant cataract) that impacts subject's vision in the study eye from any cause other than DME. * Evidence/presence of amblyopia, vitreomacular traction, epiretinal membrane, foveal atrophy, or foveal ischemia, or any other condition in the macula that is thought to impair the subject's vision (other than DME). * Prior treatment with panretinal photocoagulation or focal grid macular photocoagulation in the study eye within the previous 3 months. * Prior treatment with intravitreal (IVT) steroid in the study eye (in the previous 3 months for triamcinolone, previous 6 months for Ozurdex and at any time for Iluvien). * Prior treatment with topical NSAIDs or topical steroids in the study eye within 1 month. * Prior treatment with systemic corticosteroids or systemic anti-VEGF therapy within 3 months. * Prior vitrectomy in the study eye. * Prior intraocular surgery in the study eye except for cataract surgery. Cataract surgery within the previous 6 months in the study eye is excluded. * Intraocular pressure (IOP) of \>22 mmHg in the study eye or use of \>2 antiglaucoma agents (combination agents count as 2 agents) in the study eye. * Evidence of infectious dacrocystitis, significant blepharitis, active conjunctivitis, infectious keratitis, or scleritis in either eye, or any other condition that might affect the safety of the IVT injection. * Current active proliferative diabetic retinopathy (PDR), active anterior segment neovascularization (ASNV), active retinal neovascularization, or the presence of vitreous hemorrhage in the study eye. * Poorly controlled DM. * Uncontrolled hypertension * Prior treatment with ocriplasminin the study eye within 3 months