In one study, all 6 biomarkers for Alzheimer’s disease, such as Amyloid-ß, tau protein, glial fibrillary acidic protein, and neurofilament light chain, were found in greater quantitates in eye fluids (aqueous humor, vitreous humor, and tears) than in plasma [228]. The gene discussed is MAPT; the disease is early-onset autosomal dominant Alzheimer disease.