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    By Jaime Zacharias, MD; Claus-Dieter Ohl, MD, PhD
    Cataract/Anterior Segment

    Current understanding of the intricate micro-fluidic aspects of micro-coaxial axial and torsional phacoemulsification is limited. This film uses high-speed video techniques recording up to 500.000 frames per second, complemented with particle image velocimentry (PIV). This method allowed to evaluate fluid streaming, cavitation and tissue-tip interaction with great detail. Real cataract fragments were used to evaluate repulsion using axial and torsional modes. Also the role of mechanic lens disruption versus cavitation based disruption is explored. Light scattering commonly observed near vibrating phaco tips was correlated to non-cavitation microbubbles generated by ultrasonic degassing of the inrrigating fluid. These new findings can help improve the micro-fluidics of phaco to further improve surgical outcomes.