CP and Alzheimer disease: Building on our recent review discussing the interplay between copper, iron vitreoretinal disorders (VRDs), and subretinal drusen imaging—and considering that both copper and iron have been successfully quantified in biological fluids of patients with AD—we sought to investigate whether the copper-binding protein (CP) and the iron-storage protein ferritin (FT) could also be reliably detected in ocular humors collected during VRD surgery.