An intraoperative, marker-less visualization system and method for visualizing three-dimensional surface structures and depth structures of a patient during an intervention. A C-arm carries a C-arm projection module and a camera, and visualization spectacles include an HMD (head-mounted device) projection module and a camera. The projection modules serve for projecting structured light. A processor computes a combined image data set in order to project the latter onto spectacle lenses of the visualization spectacles.
