The aim of this study is to find the incidence of dry eye disease in patients with HT, to analyze the concentrations of biomarkers in tears (IL-1β, TNF-α, MMP-9, IL-6, IL-8, IL-10, IL-17A), and to analyze correlations between ocular surface parameters and tear biomarkers. This evidence concerns the gene CXCL8 and hematocrit.