GFAP and Schnyder corneal dystrophy: NfL and GFAP levels did not differ between patients with normal and abnormal MoCA scores (p = 0.20 for NfL, p = 0.45 for GFAP; Fig. 3a,b) or between patients with SCD, SDI or MDI (p = 0.680 for NfL, p = 0.895 for GFAP; Fig. 3c,d).