Testing for association using conditional logistic regression analysis with the top PSP GWAS SNPs identified rs1768208 (OR=1.65, P=3.86 × 10−5), an intronic SNP in MOBP (myelin-associated oligodendrocyte basic protein), and rs242557 (OR=1.48, P=1.20 × 10−3) at the MAPT locus to be associated with CBD. The gene discussed is MAPT; the disease is red-green color blindness.