There are three principal approaches for the achievement of good near and far vision concomitantly.
The first is the establishment of a functional multifocality in the visual system, the second is the establishment of a binocular divergence with one eye focused for far vision and the other for near (i.e., monovision), and the third is the attempt to restore normal accommodation.
This design strategy trades off some of the benefits of seeing through a single zone in order to have a greater range of focus. While many multifocal patients can read without glasses, their distance vision may not be as sharp as it might be with a monofocal IOL.
Moreover, use of these IOLs has grown only 6% per year since 2010. New presbyopia-correcting IOLs, including accommodating and toric accommodating designs, are being developed with an eye toward expanding the stunted market.
forecasts nearly 11% growth in presbyopia-correcting IOLs through the end of 2016 as new options become available. Presbyopia correction can be approached in a number of ways.
Institute of Vision and Optics (IVO), University of Crete, Medical School, Heraklion, 71003 Crete, Greece Received 7 March 2011; Revised 5 July 2011; Accepted 12 July 2011Academic Editor: Rupert M. In the attempt to manage presbyopia, different intraocular lens designs have been proposed such as monofocal IOLs with monovision or multifocal IOLs.
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