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I would think that what your doctor is talking about is a cloudy posterior capsule that is blocking some of your vision in an eye that had cataract surgery in the past.
When your cataract is removed a "bag" is left behind. This bag has a back surface called the posterior capsule. Your artificial lens (PCIOL) is placed into this bag during surgery.
In a number of patients, months or years after they had their cataract removed and an artificial lens placed inside their capsular bag, the back (posterior) part of the bag becomes cloudy. Some patients liken it to their cataract "growing back" and have symptoms of glare, blurry vision etc.
This is not a serious condition and is easily treated in your ophthalmologists office with a special instrument called a YAG laser. After putting a numbing drop in your eye a special contact lens is sometimes placed on your eye and, in a few brief moments, the YAG laser "removes" the cloudy posterior capsule. There is no post op recovery time needed, no patch, no drops and you can expect your vision to return within a few moments to hours.
The cloudy posterior capsule almost never "grows back" or gets re-cloudy.
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