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The study aims to highlight the importance of appropriate sizing of yttrium-aluminum-garnet (YAG)–capsulotomy. We report a case of a patient who developed sudden loss of vision, due to an unprecedented posterior dislocation of the posterior chamber intraocular lens, following an apparently uncomplicated YAG laser capsulotomy for a posterior capsular opacification (PCO), which was restored to complete visual recovery. We also stress the importance of appropriate size of the YAG openings. Although neodymium: YAG laser posterior capsulotomy is a safe procedure for treating PCO, it is not free from complications. Limiting the size of the YAG opening to meet the basic requirements is necessary.