Velocity distribution in the anterior chamber under cataract surgery was measured by using PIV. Surgical hand piece induced irrigation and aspiration flow in the eye which was extracted from a pig. We simulated coaxial phacoemulsification, which activate irrigation and aspiration through a pair of coaxial pipes, and bimanual phacoemulsification, which employs two different pipes for irrigation and aspiration. Additionally, we simulated coaxial phacoemulsification with standard size (standard coaxial) and small size (micro coaxial) of surgical instrument. The maximum mean velocity of irrigation flow reached 350mm/s and 450mm/s when simulated standard coaxial phacoemulsification and micro coaxial phacoemulsification, respectively. When simulated bimanual coaxial phacoemulsification, the maximum velocity of irrigation reached 500mm/s. And we confirmed the flow such as the irrigation flowed along the corneal endothelium and entrained into the irrigation issued from another side. Around the aspiration port, flow diverged two flows. One directed toward the aspiration port and another flow in the anterior chamber without change.
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