A double blind multicenter study of patients suffering from presenile and senile cataracts was performed, bendazac Iysine salt (Bendaline(R))or a placebo was administered orally to the patients and the results were analyzed. Although subjective variability in visual acuity and in the clinical course of cataracts should be taken into consideration together with the short duration of the observation period, the results obtained demonstrate an improvement in the Bendaline(R) treated group with regard to visual acuity and lens opacity, and an aggravation in the group of patients receiving the placebo.