What you are describing is called Posterior Capsule Opacification. This is a thin memberane purposely left in place during the surgery. It provides support for the implanted lens and a barrier for the contents of the rear of the eye moving forward. It can later become cloudy and your surgeon will open a clear window through it with a laser painlessly. Since the implanted lens is now securely healed in place the support and barrier functions are no longer needed.
Once you have cataract surgery, you can no longer get a cataract in that eye. However, I’ve heard some people refer to the capsule opacification as a “secondary cataract” probably to simplify the explanation, but we never used that term because if gives the impression we would need to cut again.
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