A comparative study of the 91Z and other anterior chamber intraocular lenses

A retrospective study of 113 91Z anterior chamber intraocular lenses (IOLs) used with intracapsular cataract extraction (ICCE) was performed. The study compared operative complications, visual acuity at three and six or more months, and complications of the 91Z with other types of anterior chamber IOLs. The 91Z had a low incidence of operative complications, good short-term visual acuities, and few short-term complications. It had a high incidence of late, severe, inflammatory/hemorrhagic complications including uveitis-glaucoma-hyphema plus vitreous hemorrhage (UGH+ syndrome), cystoid macular edema, and iris chafing/bleeding. These complications necessitated removal of five lenses (4.5%). An additional 16 patients (14.2%) are under treatment for these late complications. This IOL was often difficult to remove without traumatizing the eye. I have not experienced these late complications with the other types of anterior chamber IOLs reported here; their long-term visual acuities were good and they were stable. None of them has been explanted.