Abnormal deposition of the tau protein is the hallmark feature of tauopathies, which encompasses a growing list of neurodegenerative diseases, including Alzheimer's disease (AD), frontotemporal dementia (FTD), progressive supranuclear palsy, corticobasal degeneration (CBD) and chronic traumatic encephalopathy (CTE). Here, MAPT is linked to red-green color blindness.