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The Symblepharon rings are used to prevent retraction of the conjunctiva cul-de-sac. The ring is inserted between the eye and the lid and is supported by the sclera without touching the cornea. The purpose of the Symblepharon Rings is to avoid tissue adhesion after excision of the symblepharon. The ring has a center hole to enable the patient to see. The surfaces are polished in order to avoid any abrasion of the cornea or ocular globe. The Symblepharon Rings are medical devices made of acrylic (PMMA). They must not be autoclaved, otherwise they will be damaged: ethylene oxide sterilization is recommended. The devices' family has different sizes (small, medium, large).