IL17A and keratoconus: On moving to the correlation of cytokines of KC patients (Figure 4), the IL-6 was positively correlated with IL-4 (r = 0.414, p < 0.05), and IL-1β and the IL-17 were positively correlated with IL-5 (r = 0.939, p < 0.001 and r = 0.840, p < 0.001).