In addition, given the inconsistencies in previous reports on retinal AD tauopathy—where several studies identified certain pathological tau forms in the AD retina [21, 31, 34, 65, 87] that two earlier reports could not detect [36, 88] or could partially detect [20, 70]—workshop groups focused on harmonizing the methodologies for analyzing retinal tauopathy will be useful in future research [27]. Here, MAPT is linked to Alzheimer disease.