TCF4 and Fuchs endothelial corneal dystrophy: Both SNPs are in moderate disequilibrium with the expanded form of the CTG18.1 trinucleotide repeat in intron 2 of TCF4 (r2=0.47), consistent with the previously reported values of 0.65 and 0.31 between the triplet repeat and rs613872 in FECD cases and controls, respectively21.