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requires a balance between fluid input and output, which is a balance between irrigation, aspiration and leakage. Repeated partial collapses of the anterior chamber, and iris fluttering during removal of the nucleus are signs of inadequate fluid supply, which can be adjusted by changing the height of the gravity feed supply bottle. A height of 650mm above the eye is usually enough to compensate outflow almost immediately. During emulsification, the abrupt variations in flow at the start and end of emulsification of each fragment can cause fluctuations

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