Neurodegenerative diseases that show a primary pathology consisting of inclusions of filamentous tau can be designated as a tauopathy and include diseases like sporadic corticobasal degeneration (CBD), progressive supranuclear palsy (PSP), Pick’s disease (PiD), as well as hereditary FTD and parkinsonism linked to chromosome 17 (FTDP-17T). This evidence concerns the gene MAPT and red-green color blindness.