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. 2014 Jul 30;14:96. doi: 10.1186/1471-2415-14-96

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Copyright © 2014 Sharif-Kashani et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Occlusion break surge: gravity-based systems. The schematic depicts (A) the anterior chamber and (B) IOP. During unobstructed flow, aspiration and infusion are balanced to maintain a stable anterior chamber (A1) and IOP (B1). When the phaco tip becomes occluded with nuclear material, fluid flow is blocked (A2) and IOP increases (B2). With occlusion break, vacuum stored in aspiration tubing during occlusion (ie, no flow) can cause a sudden increase in aspiration rate (A3) and lead to a drop in IOP (B3). Infusion during unobstructed flow after occlusion break leads to recovery of the anterior chamber (A4) and IOP (B4). IOP = intraoperative pressure.