IL6 and keratoconus: Levene’s Test for homogeneity of variances was not significant for any comparison at either time point (one month: KC/GRO: p = 0.224; TNF-alpha: p = 0.618; IL-6: p = 0.159; six months: KC/GRO; p = 0.06; TNF-alpha: p = 0.587).