Abstract: Provided is a controller for an electrical drive unit—which drives a treatment needle—of an ophthalmosurgical handpiece, comprising a generator unit, which provides a control variable with control oscillation, wherein the control oscillation has a first oscillation component at a first control frequency, wherein the first oscillation component is settable depending on a first ratio of a mechanical deflection amplitude of the treatment needle to the electrical control variable at the first control frequency. It is proposed that the generator unit is configured to provide the control oscillation of the control variable with at least one further oscillation component at a further control frequency, different than any other control frequency, in such a way that the further oscillation component is settable depending on a further ratio of the mechanical deflection amplitude of the treatment needle to the electrical control variable at the respective further control frequency.

Abstract: An optical system, comprising a microscope housing having a coupling opening for a detachable coupling of an objective lens of the optical system such that the objective lens is arranged in a microscope beam path of the optical system for imaging an object region of the objective lens. The optical system further comprises an assembly. The assembly comprises an assembly housing having a coupling element for the detachable coupling of the coupling element and the coupling opening of the microscope housing; a wavefront analysis system, which provides a wavefront beam path; and a beam splitter, which is arranged in the wavefront beam path. The objective lens, the beam splitter and the wavefront analysis system are arranged such that during the coupling of the coupling opening and the coupling element, the objective lens is arranged in the microscope beam path and the object region is arranged in the wavefront beam path.

Abstract: A surgical system controls a fluid and includes an irrigation line and a first fluid vessel for holding the irrigation fluid. The irrigation line connects the first fluid vessel to a handpiece. An aspiration input line connects a suction pump to the surgical handpiece and permits the suction pump to draw fluid through the surgical handpiece. A pressure sensor detects the pressure of the fluid in the aspiration input line. An aspiration output line connects the suction pump to a collection vessel to permit fluid from the suction pump to be conducted into the collection vessel. A second fluid vessel accommodates irrigation fluid therein and an aspiration ventilation line connects the second fluid vessel to the aspiration input line. A venting valve in the aspiration ventilation line is switchable in dependence upon the fluid pressure in the aspiration input line.

Abstract: A surgical system controls a fluid and includes an irrigation line for conducting an irrigation fluid; a first fluid vessel for holding the irrigation fluid; and, a surgical handpiece. The irrigation line has a first end connected to the first fluid vessel and a second end connected to the handpiece.