MAPT and Schnyder corneal dystrophy: Meta‐analyses were performed using cross‐sectional data from nine cohorts (n = 7219, mean age (SD): 71.17 (5.9), 56.5% female) to determine associations of SCD‐plus features with positron emission tomography (PET)– or cerebrospinal fluid (CSF)–derived amyloid beta (Aβ) and tau biomarkers.