The aim of the study is to determine the influence of some selected immunological factors upon the pathogenesis of senile cataract and cataract in diabetic people. Immunofluorescent pictures of opacities lenses in senile cataract patients and in diabetic cataract patients were compared. The fluorescent microscopic examination of these preparations revealed green colored concrements. The concrements thus observed proved the presence of a given class immunoglobulin in the lenticular nucleus sections. In all preparations (100%), the presence of IgG was found. None concrements' of C4 and the fibrin were spotted in the observed preparations.