Tau plasma levels in abnormal SCD participants did not correlate with CSF levels of Aβ42 (β = 0.001; 95% CI −0.007 to 0.004, p = 0.527), tau (β = 0.003; 95% CI −0.006 to −0.001, p = 0.393), and p-tau181 (β = 0.019; 95% CI −0.038 to −0.001, p = 0.343) after controlling for age, gender, and education. This evidence concerns the gene MAPT and Schnyder corneal dystrophy.