| 摘要 |
A method and apparatus for operating on the human eye detects changes in load, more specifically, mechanical impedance, of the transducer and controls aspiration based on the load changes. A change from a lower load to a higher load indicates that harder tissue is being encountered and accordingly causes aspiration amount to increase. Conversely, a change from a higher load to a lower load indicates that aspiration amount should be quickly decreased since the tissue which is being encountered is softer. One way to detect the impedance is by a sensor, e.g., a piezoelectric element coupled to the operating needle detecting the movement thereof.
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