The present disclosure is a femtosecond, wherein the position of the suction cone in the z-direction is measured by a measuring device to generate data, which is processed and used to generate data-based image representations, histograms, or other graphs. Provide a system for ophthalmic surgery. The image representation may include at least one threshold marker. The disclosure further comprises the steps of measuring the position of the suction cone with a measuring device and transmitting data regarding the position to the processor, the processor processing the data and using it an image presented on the display Providing a method of docking in femtosecond laser eye surgery, including the steps of creating a representation, a histogram or other graphs.
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