Small differences (disparities) between the two retinal images provide information about the distance, orientation and shape of objects, especially if these objects are positioned within reach. On the one hand this information serves visual perception, on the other hand it serves the control of eye movements and other body movements like, for instance, grasping movements of the hand. The purpose of this project is to examine whether the brain processes the same disparity information separately for perception and action or whether perception and action use different aspects of disparity information. Visual illusions and adaptation to disparity will be tools to examine differences between the processing disparity subserving depth perception, eye movements and hand movements.