This article is more than 5 years old. Information may no longer be current.
Study: Multifocal IOL position had no impact on contrast sensitivity
Click Here to Manage Email Alerts
BERLIN — The position of the multifocal IOL in the capsular bag does not appear to alter visual results following cataract surgery, a study found.
"The IOL position did not affect the postoperative contrast sensitivity when it was implanted in the bag," Hiroko Bissen-Miyajima, MD, said at the European Society of Cataract and Refractive Surgeons meeting.
Dr. Bissen-Miyajima presented results from a study that she conducted with colleagues, examining 35 eyes of 19 patients implanted with the Tecnis ZM900 (Advanced Medical Optics) multifocal IOL. They measured pupil size and diffractive rings of the IOL using an anterior segment analyzer with normal lighting, and the distance between the pupil center and the IOL using computer software.
They found that contrast sensitivity was within the typical range for both low and intermediate spacial frequencies, with good visual acuity results.
However, patients with smaller pupils tended to be less satisfied with visual outcomes and had lower contrast sensitivity, Dr. Bissen-Miyajima said.
A certain degree of decentration for an in-the-bag multifocal diffractive IOL [implantation] can be tolerated with no effect on visual performances and quality of vision. ... It is definitely recommended to the surgeon to still center the rhexis and the lens. However, we learned by this study that we should not remove the lens for decentration, at least in that range of 0.25 mm, because it should not explain nonadequate postoperative results.
– Béatrice Cochener, MD
Department of Ophthalmology, University of Brest