On the other hand, no TLR expression differences were observed between KC patients with and without allergic disease (TLR2 expression in neutrophils (759.1 ± 108.8 vs. 709.7 ± 108.3; p = 0.167); TLR2 expression in monocytes (3139.3 ± 715.5 vs. 2790.9 ± 557.8; p = 0.109); TLR4 expression in neutrophils (664.0 ± 120.4 vs. 674.8 ± 144.1; p = 0.800); TLR4 expression in monocytes (1574.8 ± 308.5 vs. 1621.7 ± 352.8; p = 0.659). This evidence concerns the gene TLR4 and keratoconus.