CD8A and pars planitis: Among examined effector and regulatory cell subsets and clinical characteristics, we found only the correlation of PB Th1 cell subsets, detected as CD3+CD8-IFN-γ+ and CCR4-CXCR3+IFN-γ+, with a duration of pars planitis (r = 0.65, p = 0.008 and r = 0.68, p = 0.004, respectively) (Figure 3).