 The Endocuff is a medical device, approved in 2012 by the American Food and Drug Administration, which was also authorized by the European Agency for the Evaluation of Medicinal Products. The aim of the cuff is to optimize the view of the colonic mucosa. There is also a transparent cap on the market, which is used in colonoscopy for a better evaluation of the mucosa and polyp detection. The goal of this project is to conduct a prospective randomized trial for clarification of the hypotheses, whether the usage of the Endocuff increases the detection rate of adenomas compared to the transparent cap or compared to standard colonoscopy. 