Multifocals and Accommodating/Bilateral Implantation of Different Multifocal Intraocular Lens (IOLs)

Overview

The purpose of this study is to evaluate vision at different distances (far (13 ft), intermediate (2.0 ft) and near (13 to 15 in)) with and without the patient's glasses (if the patient wears them), range of vision (the difference between the farthest distance and the closest distance that the patient can comfortably read 20/25 of the near card), and patient satisfaction (how satisfied/happy is the patient with their vision) following bilateral implantation of different multifocal IOLs after routine phacoemulsification. The patients are being asked to participate in this study because you have had cataract surgery and have received one of the IOLs implanted: ReSTOR +4.0 D, ReSTOR +3.0 D, Crystalens, and/or ReZoom. The investigator in charge of this study is Dr. Helga Sandoval. This study is being conducted at Storm Eye Institute at the Medical University of South Carolina and will involve approximately 50 volunteers.

STUDY DESIGN: This is a prospective, non-randomized, unmasked pilot study. 1. SETTING: Storm Eye Institute, Medical University of South Carolina, Charleston, SC 2. SUBJECTS A total of 50 patients of both sexes and any race or ethnic background who underwent uneventful routine bilateral cataract extraction and multifocal or accommodating intraocular lens implantation will be included. Subjects will be divided in 5 groups of 10 subjects each based on the IOL implanted as follows: ReSTOR +4.0 D, ReSTOR +3.0 D, Crystalens, ReZoom, and Mix-and-match (patients implanted with ReSTOR in one eye and ReZoom in the fellow eye). Assessment included a thorough medical history and a complete eye examination. The latter will include ETDRS visual acuity at distance (4 mts), intermediate (60 cm) and near (33 or 40 cm accordingly to the lens, under photopic conditions) evaluated uncorrected and best-corrected as well as distance-corrected near and intermediate visual acuity, , and range of vision (uncorrected and distance-corrected); the previous tests will be done per eye and both eyes (visual summation). Slit-lamp exam, eye dominance, stereopsis, pupil size under photopic conditions, corneal topography and a satisfaction questionnaire will be evaluated as well. A defocus curve will be performed as follows: a phoropter and a 100% contrast ETDRS chart positioned 4 meters from the subject under photopic lighting conditions will be used. Manifest refraction will be used to designate the zero (0) baseline. To begin the testing, subjects will be defocused -5.00 D spherical correction from their best distance correction (manifest refraction). The logMAR acuity at this refraction will be recorded. Minus spherical power will be decreased in 0.50 D increments (i.e., -4.50 D, -4.00 D, -3.50 D, etc.) with logMAR acuity recorded at each change in correction until only the best distance correction (manifest refraction) remains. In a further step, subjects will be defocused +2.00 D spherical correction from the best distance correction (manifest refraction) and the logMAR acuity will be recorded. Plus spherical power will be decreased in 0.50 D increments (i.e., +1.50 D, +1.00 D, +0.50 D) with logMAR acuity recorded at each change in correction until only the best distance correction (manifest refraction) remains.