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Purpose:

To evaluate longitudinal power settings for optimally efficient lens fragment removal, using the Centurion machine.

Setting:

John A. Moran Eye Center, University of Utah, Salt Lake City, USA.

Design:

Experimental study.

Methods:

Porcine lens nuclei were cut into 2.0 mm cubes. Experiments were conducted at 100% torsional power; vacuum set at 500 mm Hg, aspiration 50 mL/min, and intraocular pressure 110 mm Hg. A 20-degree tip with a 30-degree bevel was used. Longitudinal power was tested between 20% and 100%. Efficiency (time for fragment removal) and chatter (the number of times the fragment bounced from the tip) were measured.

Results:

A linear increase in efficiency was observed from 20% to 100% longitudinal power (R 2= 0.9281, slope=− 0.0271). An efficiency slope change occurred at 60% power, with the largest incremental change in efficiency between 20% and 60%(R 2= 0.9756, slope …