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There are a couple of possibilities. One is that the lens has become dislocated. This can come from weakness in the area holding the lens (called the "capsular bag"). Some tissues are very delicate and can rupture. The problem can be fixed with a second procedure.
Another possibility is that the rear of the capsular "bag" that holds the lens has become opaque. This situation occurs in about 20% of cataract surgeries and is called "posterior capsule opacification." It can occur a few days after surgery or even months afterward. It is treated (often in the physician's office) with a YAG laser to remove the opacity.
Please let me know if you have questions.
Do you know whether this type of correction is necessary immediately or can it wait?
It needs to be evaluated right away. If it is the common PCO (posterior capsule opacification) it will most likely be done right there in the same appointment. If it is a lens dislocation, surgery would probably be scheduled within a few days.
So there should be no putting this off, no matter how inconvenient it is to bring it about right now.
Sorry, but that really is the case.