IL6 and exfoliation syndrome: Further analysis revealed that other types of secondary glaucoma (a pool of neovascular glaucoma (NVG), Posner-Schlossman syndrome (PSS), uveitic glaucoma (UG) and secondary glaucoma post silicone oil tamponade) showed significantly higher IL-6 levels (SMD = 2.57, 95% CI 1.20–3.94, P = 0.004) but pseudoexfoliative glaucoma (PEXG) did not show this association (Fig. 2B).