Which procedure is the removal of a cataract leaving posterior lens capsule intact?

The procedure you are referring to is called extracapsular cataract extraction (ECCE). In this procedure, the anterior capsule of the lens is removed, along with the cataractous lens material, but the posterior capsule is left intact. This allows the surgeon to insert an intraocular lens (IOL) into the eye, which can help to restore vision.

ECCE is a relatively common procedure and is typically performed on an outpatient basis. It is generally considered to be a safe and effective procedure, with a high success rate.