Patent ID: 8382781

Claim:
A device for ophthalmic surgery, comprising: a vacuum-pump arrangement for generating a vacuum serving for fixing a suction ring to an eye, an evacuation-path system for transmitting the vacuum to an interface port which permits the separable attachment of a suction-ring instrumentarium including the suction ring, a control unit for controlling the vacuum-pump arrangement, pressure-measuring components for measuring an atmospheric pressure and a vacuum pressure from the vacuum, the control unit adapted to ascertain a differential pressure between the measured vacuum pressure and the measured atmospheric pressure, wherein the control unit is adapted to: bring about a test-operation mode of at least one vacuum pump of the vacuum-pump arrangement with a predetermined setting of the pumping power, ascertain the differential pressure on the basis of one or more values of the vacuum pressure measured during the test-operation mode, and implement the test-operation mode only when the suction-ring instrumentarium is not attached to the interface port.