A double blind study of the effect of tranexamic acid (AMCA) on late hyphaema after cataract surgery is reported. A total of 244 patients were included in the study after strict selection. It was shown that the incidence of late hyphaema in the treated group was significantly lower at the 5% level than that in the placebo group. The conclusion is made that the fibrinolytic inhibitor tranexamic acid can be used therapeutically or prophylactically to decrease the risk for re-bleeding after ocular surgery.