The results of the repair kinetics assay showed that lymphocytes had a higher residual level of fluorescence of γ-H2AX at 24 h, but not at earlier times ( 0, 0.5, and 4 h), after irradiation with 2 Gy in patients with severe OM, compared with patients with mild OM. The gene discussed is H2AX; the disease is ocular melanoma.