Refractive Error in Patients After Cataract Extraction with Iris–Fixated Sutured Posterior Chamber Intraocular Lenses

Abstract

Abstract: : Iris–fixated sutured intraocular lenses are growing in popularity for use when there is no capsular bag support for a posterior chamber intraocular lens. Often, the lens power used is the same as if the lens were being placed in the capsular bag. Purpose: The purpose of this study was to evaluate refractive disorders in postoperative eyes that had undergone cataract extraction with iris–fixated sutured intraocular lens placement. Methods: Three eyes underwent cataract extraction with sutured iris–fixation of a posterior chamber intraocular lens. All surgery was performed by the same surgeon. Partial anterior vitrectomy was performed at the time of surgery, if indicated, for vitreous prolapse. The lenses sutured were foldable, three–piece acrylic lenses (Alcon MA60AC). All lenses were secured using 10–0 nylon placed to the peripheral iris. The lens power had been calculated preoperatively using a modified SRK–II formula for a postoperative refraction of plano (with conventional capsular bag placement). Refraction was measured postoperatively at six weeks using automated refraction and manifest refraction data. Results: All three eyes refracted postoperatively to spherical equivalent refractive disorders of less than 1.00 D (–0.75 to +0.83 diopters). No eye increased from preoperative astigmatic error greater than 0.75 diopters (plano to –0.75 diopters). Conclusions: Modified SRK–II calculations for intraocular lens power may provide a reliable calculation of postoperative refractive disorder in patients who undergo cataract extraction with iris–fixated sutured intraocular lenses.

Keywords: cataract • refraction