MAPT and red-green color blindness: Patients with corticobasal degeneration (CBD) and PSP have shown higher CSF total and phospotau levels (Aerts et al., 2011), and patients with DLBD showed similar CSF tau levels to PD patients in one study (Ohrfelt et al., 2009), while other authors found higher CSF tau levels in AD than in DLBD, in DLDB higher than in PDD, and in PDD higher than in PD (Parnetti et al., 2008).