Laser suture lysis through thick blebs using the Blumenthal lens.

L aser suture lysis is commonly performed after trabeculectomy and is titrated to control postoperative flow through the filter to a target intraocular pressure. Originally, the flat edge of a Zeiss 4-mirror lens was used to compress the conjunctiva and Tenon capsule to view the sutures. The Hoskins lens designed for suture lysis improved the view and allowed eyelid elevation for better exposure. The Ritch suture lysis lens was designed to provide good compression and a reasonably wide field of view that helps in locating sutures. Recently, the Blumenthal lens was introduced for suture lysis.