Several exclusion criteria were applied: lack of OCT-A measures (n = 28), lack of brain MRI (n = 11), time between OCT-A and brain MRI > 6 months (n = 4), lack of Aβ positron emission tomography (PET) or CSF biomarkers (n = 21), lack of APOE genotype (n = 1), and finally, ophthalmological conditions that could interfere with the OCT-A measurements (n = 23: n = 4 due to retinal surgery, n = 1 due to retinopathy, n = 7 due to open-angle glaucoma, n = 3 due to IOP > 24 mmHg, n = 4 due to other reasons)). The gene discussed is APOE; the disease is open-angle glaucoma.