Ozil IP torsional mode versus combined torsional/longitudinal microcoaxial phacoemulsification
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PURPOSE. To compare the safety and efficacy of microcoaxial phacoemulsification surgeries performed with the Ozil Intelligent Phaco (IP) torsional mode and combined torsional/longitudinal ultrasound (US) mode using the Infiniti Vision System (Alcon Laboratories). METHODS. In this prospective randomized comparative study, 60 eyes were assigned to 2.2-mm microcoaxial phacoemulsification using the Ozil IP torsional mode (group 1) or combined torsional/longitudinal US mode (group 2). The primary outcome measures were US time (UST), cumulative dissipated energy (CDE), longitudinal and torsional ultrasound amplitudes, mean operation time, mean volume of balanced salt solution (BSS) used, and surgical complications. RESULTS. Both groups included 30 eyes. Mean UST, CDE, and longitudinal and torsional ultrasound amplitudes in group 1 were 1 minute 15 +/- 34.33 seconds, 8.74 +/- 5.64, 0.43 +/- 0.74, and 25.56 +/- 8.56, respectively, and these parameters in group 2 were 1 minute 40 +/- 51.44 seconds, 9.28 +/- 5.99, 3.64 +/- 1.55, and 3.71 +/- 1.34, respectively. UST and longitudinal amplitudes were found to be significantly low in group 1 (p<0.001, p<0.001), whereas torsional amplitude was found to be significantly high in this group (p=0.001). Mean volumes of BSS used in groups 1 and 2 were 63.30 +/- 18.00 cc and 84.50 +/- 28.65 cc, respectively (p=0.001). CONCLUSIONS. The Ozil IP torsional mode may provide more effective lens removal than the combined torsional/longitudinal US mode with a lower UST and volume of BSS used.