Visually significant cataract develops in the majority of phakic eyes within 2 years of pars plana vitrectomy (PPV) (Braunstein & Airiani 2003). Altered fluid dynamics during phacoemulsification in these eyes can lead to excessive deepening of the anterior chamber with wide mydiasis and reverse pupil block (Cionni et al. 2004), whereas misdirection of irrigation fluid behind the iris can lead to paradoxical miosis (Ahfat et al. 2003; Braunstein & Airiani 2003). We report a novel phenomenon of posterior segment collapse noted after apparently uncomplicated phacoemulsification and discuss a possible mechanism.
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