NEFL and pre-descemet corneal dystrophy: Furthermore, a significantly higher NfL level was noted in the PDCD group, compared to both the normal control (mean ± standard deviation; 18.92 ± 7.25 vs. 8.23 ± 4.15; p < 0.001) and the PDN group (mean ± standard deviation; 18.92 ± 7.25 vs. 13.85 ± 5.18; p = .048).