After-cataract is a remnant of an extracapsular cataract extraction. It may also be seen following a discission or needling or a perforating injury involving the lens. The after-cataract may assume many forms. One of these configurations is a dense ring behind the iris and was first described by Soemmerring in 1828.1 This type of after-cataract is referred to as a "Soemmerring's ring." Dislocation of this ring has rarely been documented. A posterior dislocation is least commonly found and has never been removed operatively and reported.
Cortical remains may be entrapped between the anterior and posterior capsule following a penetrating insult to the lens. The cells lining the anterior capsule may continue to form new lens fibers which are entrapped between the anterior and posterior capsular remnants. At times the capsular remains form a ring partly hidden behind the iris and only the edge may be visible through the pupillary
LAIBSON PR, McDONALD PR. Removal of Dislocated Soemmerring's Ring. Arch Ophthalmol. 1965;73(5):643-645. doi:10.1001/archopht.1965.00970030645009