This video course shows a thematic approach to problems occurring during cataract surgery. We have collected in the last years a varied collection of image material. Thus we are able to demonstrate different kinds of complications such as problems during capsulolorhexis, poor dilatation of the pupil, pseudoexfoliation/instable lens due to zonular weakness, dealing with capsular tears, problems during lens implantation, lens exchange, vitreous hydration... During this course we will try to cover these topics.