Statistical analysis of 54 eyes with chronical endogenous uveitis, mostly juvenile, treated with simple or combined pars plana vitrectomy. Most striking is the high frequency of localized or combined cyclitis with good functional results, although complications of the disease (retinal detachment, vasculitis, PVR, macular damage) are extremely frequent in cyclitis, and this group also includes, three cases of postoperative phthisis. The best argument in favor of an chronic uveitis is the fact that an overwhelming majority of the patients were able to switch from rigorous systemic preoperative medication to simple eye drops or no treatment at all.