Video S1. A case of phacoemulsification is shown in which the technique of counting ‘Judders’ is demonstrated. The technique is utilized at the commencement of irrigation/aspiration (I/A). Initially, the majority of ophthalmic viscoelastic device (OVD) is removed from the anterior chamber. When the OVD then starts to egress from behind the intraocular lens (IOL), ‘Judders’ are seen. In this case, three ‘Judders’ occur before adequate OVD is aspirated, indicating complete removal of OVD. No further ‘Judders’ are seen once OVD removal is complete. This allows us to judge the adequate removal of OVD without placing the I/A tip posterior to the optic.

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