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In flow rate vitrectomy, the major concept is »isoflow » which means that you need to perform a vitrectomy with an equal flow for the infusion and for the aspiration. This is the mandatory condition to allow a vitrectomy in « isopressure”. This understanding leads you to an important concept which is that your infusion flow will define the allowed aspiration flow. I will present you my way of improving the infusion-flow in 23/25 and 25 G.