MAPT and Alzheimer disease: Notably, both Oligo-tau+ RGC counts and percent Oligo-tau+ RGC population were significantly elevated in MCI and AD (2.0-3.5-fold; P < 0.05-<0.0001) compared to CN controls in the ST retina (Fig. 4c, d; extended data across retinal subregions in Suppl Fig. 3b, c).