[Change in the fish crystalline lens in experimental diplostomatosis].

Experimental infection of roach with cercariae of Diplostomum spathaceum has shown that the pentration of larvae into the eyeball proceeds in hematogenous way. Metacercariae are localized in the cortical layer of the crystalline lens thus causing destructive changes of its fibres and the dimness of the lens. The appearence of the dimness of the lens carries out without any apparent reactive changes in its epithelium. This enables to distinguish a parasitic cataract from all other varieties of cataracts.