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The cataract is a disease in which crystalline lenses get opacified because of aging or others. In the treatment of heavy cataract, opacified lenses must be replaced with artificial lenses. The PEA isrecently a major technique for removing opacified lenses. There is, however, a problem called as surge phenomenon still to be solved in the PEA. The surge phenomenon is that an intracameral pressure accidentally falls down to an extreme and this would invite a possibility of blindness in worst case. Though there exist some passive countermeasures against it, but not enough to secure the safety of surgical operation. This paper describes of how to control an intracameral pressure by employing modem control theory. By our fabricated modeled eye we could simulate a surge phenomenon. Having designed a state-predictive LQ servo system, we succeeded to restrict the surge to an allowable level.

Intracameral Pressure Control during Phacoemulsification Aspiration