Fortas pump Advanced cassette system VIS (Variable Intervals and Strokes) APS-Plus (Auto Pulse System-Plus) High speed vitreous cutter Fortas pump The refined peristaltic pump achieves vacuum rise at shorter times than the venturi pump. Advanced cassette system The phaco cassette incorporates the unique irrigation assist bottle to improve anterior chamber stability. When the occlusion breaks, the irrigation assist bottle enables the surge reduction with instant increase of irrigation flow into anterior chamber. VIS (Variable Intervals and Strokes) VIS provides dual-oscillation of conventional pulse and ultra-short duration pulse. The nucleus can be emulsified easily with less energy by using dual-pulse oscillation.