Elevated values of certain interleukins (IL-1β, IL-6, IL-8, IL-17, TNF-α) have been found in the tears of patients with GD [13,14], while dry eye disease (DED) is described with HT, without a clear immunological background, and the exact type of dry eye has not been confirmed so far [15,16,17]. The gene discussed is IL6; the disease is hematocrit.