CLINICAL-EVALUATION OF A 5-ZONE REFRACTIVE MULTIFOCAL INTRAOCULAR-LENS

Purpose: To evaluate the clinical performance of a five-zone refractiv e multifocal intraocular lens (AMO, model MPC-25NB, Array(R)). Methods : We performed a retrospective clinical trial of 31 cataract patients (mean age 64.3 years). The parameters studied were intraoperative and postoperative complications, distance and near visual acuity, spectacl e use, decreased number of corneal endothelial cells, contrast sensiti vity, percentage of glare disability, near binocular vision, and depth of focus. Results: Intraoperatively, iris damage occurred in two eyes (4.2%), vitreous loss in one eye (2.1%), and consecutive rupture of Z inn's zonule and vitreous in one eye (2.1%). Postoperatively, posterio r capsule opacification was observed in two eyes (4.2%), temporary int raocular pressure increase in one eye (2.1%), and cystoid macular edem a in one eye (2.1%). Uncorrected distance visual acuity of 20/40 or be tter was achieved by 34 of 37 eyes (91.9%) with less than 1.5 diopters of preoperative keratometric astigmatism; best corrected distance acu ity of 20/20 or better was achieved by 41 of 45 eyes (91.1%). Near vis ual acuity with distance correction of 20/40 or better was achieved by 29 of 43 eyes (67.4%). These data were compared retrospectively with data from control patients who received monofocal lenses, and no signi ficant differences in the decreased number of corneal endothelial cell s were found. Mean contrast sensitivities were within normal range for all spatial frequencies. Percentage of glare disability and near bino cular vision were within normal limits. Conclusions: Eyes implanted wi th the five-zone refractive multifocal lens showed better near visual acuity than control eyes and compared favorably in other aspects of vi sual function, indicating that these lenses are effective and safe.