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Once a cataract has been removed, it will never come back again. It is possible, however, to develop an after-cataract membrane or posterior capsular opacity (PCO) weeks to years after cataract surgery. Although this cloudy membrane that forms behind the intraocular lens can reduce vision much like the original cataract did, it is much more easily and safely removed with a YAG laser treatment, which removes this film forever.
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