IL6 and keratoconus: In the keratoconus group, using the CORR procedure, we found statistically strong correlations of IL-6 lacrimal concentrations with the disease stage (r = 0.56, p < 0.01), keratometry (r = 0.55, p < 0.02), pachymetry (r = −0.64, p < 0.048), and corneal hysteresis (r = −0.53, p < 0.02).