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    Cataract/Anterior Segment

    Three different techniques to pass suture through the eyelet of a polymethyl methacrylate intraocular lens (IOL). a. Torque-antitorque: with this suture pattern the tilt induced by the suture on one haptic is counteracted by the torque placed on the second haptic. When this technique is used, it is important to remember how each suture is laced. b. Neutral torque: notice how both ends of the suture end up on top of the haptic, which prevents any induced tilt once the IOL is sutured. c. Cow hitch: with this type of suture pattern no tilt is induced on the IOL; however, the suture will not slide through the eyelet when the suture is eventually buried on the scleral surface.