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This study is a comparison of the quality of vision provided by AMO Tecnis Z9000 three-piece silicone posterior chamber intraocular lens and Alcon Laboratories MA60 three-piece acrylic posterior chamber intraocular lens.
Today, intraocular lenses (IOLs) are routinely implanted after cataract extraction. Cataract surgical techniques are constantly developing due to innovations in surgical implantation and IOL manufacturing processes. Although material development and surgical implantation have advanced extensively during the past several years, there has been little attention paid to the improvement of the optical quality of IOLs.
It has been documented that the vision of an IOL patient is no better than that of a person with healthy eyes of a similar age, i.e., when a 65-year-old patient with cataracts has them removed and implanted with an IOL, the resulting visual outcome is no better than the visual quality of a 65-year-old without cataracts. The fact that the visual quality of the IOL patients is no better than that of their same-age counterparts is surprising because an IOL is optically superior to the natural crystalline lens. This fact may be explained by aberrations.
Aberrations cause incoming light that would otherwise be focused to a point to be blurred, which in turn causes a reduction in visual quality. This reduction in quality is more severe under low luminance conditions because ocular aberrations increase when the pupil size gets larger. The Z9000 is an IOL that is designed to counteract the spherical aberration of the cornea and thus improve the resulting visual quality of IOL patients.
Different materials and lens designs result in different visual quality. The handling of the lens, proper centration in the eye, the postoperative course, and the optical image may vary depending on the design of the lens. Two lenses will be compared: AMO Tecnis Z9000 three-piece silicone lens and Alcon Laboratories MA60 three-piece acrylic lens.
This will be a randomized, evaluator-masked study in bilateral cataract surgery patients. Each patient will be assigned to a AMO Tecnis Z9000 lens in one eye and an Alcon Laboratories MA60 lens in the other eye. All first surgeries will be on the right eye. A randomization list will be used to decide lens allocation.
A total of 80 patients (men and women) from the Singapore National Eye Centre will be enrolled in the study. All patients will undergo wavefront analysis 90-120 days postoperatively.
The two lens models look different, even in the eye, after implantation. It is not possible to mask the individual investigator at the time of surgery or personnel responsible for conducting the clinical ocular examinations (e.g., evaluation of complications, posterior capsule, IOP, pupil size) and optic evaluations (e.g., evaluation of the IOL).
Allocation: Randomized, Control: Active Control, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Single Blind, Primary Purpose: Treatment
Tecnis Z9000 intraocular lens, MA60 intraocular lens
Singapore National Eye Centre
Singapore National Eye Centre
Published on BioPortfolio: 2014-08-27T03:43:41-0400
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Insertion of an artificial lens to replace the natural CRYSTALLINE LENS after CATARACT EXTRACTION or to supplement the natural lens which is left in place.
Lenses, generally made of plastic or silicone, that are implanted into the eye in front of the natural EYE LENS, by the IRIS, to improve VISION, OCULAR. These intraocular lenses are used to supplement the natural lens instead of replacing it.
Presence of an intraocular lens after cataract extraction.
Absence of crystalline lens totally or partially from field of vision, from any cause except after cataract extraction. Aphakia is mainly congenital or as result of LENS DISLOCATION AND SUBLUXATION.
The portion of the crystalline lens surrounding the nucleus and bound anteriorly by the epithelium and posteriorly by the capsule. It contains lens fibers and amorphous, intercellular substance.
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