A photosensitive device, such as would be found in a digital scanner or camera, includes at least two sets of photosensors, the video signals from which are multiplexed together. In the process the incision is guided in the hinge region of the cornea in such a way that an undercut arises under the hinge region. The throughput rate of the clarifier is adjustable and can be determined as a function of the fill radius of the separation chamber.