The present invention comprises a method of operating an ophthalmic surgicalhand piece, providing a series of power pulses to the hand piece, each of theseries ofpower pulses having a first portion that produces torsional movement of acutting tipand a second portion that produces longitudinal movement of the cutting tip;measuring vacuum pressure; altering the duration of the first portion asvacuumpressure increases; and altering the duration of the second portion as vacuumpressureincreases.
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