MAPT and Alzheimer disease: Our group and others have demonstrated the manifestation of AD pathological features in the retinas of asymptomatic individuals, those with mild cognitive impairment (MCI), and AD dementia patients, including Aβ deposits, vascular Aβ40 and Aβ42, various aberrant tau isoforms, inflammation, vascular damage, and neurodegeneration [4, 6–8, 13, 17, 20–23, 27, 31, 33–35, 43–45, 47, 50, 51, 56, 59, 63, 65, 67, 70, 71, 73, 74, 79, 87, 89].