Continuous phase in presbyopia correction IOL : toward a sharp vision at all distances
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First Author: P.Sourdille FRANCE
Co Author(s): F. Castignoles
To explain and demonstrate the disruptive benefit of continuous phase in presbyopia correction IOLs
R&D department, Cristalens Industrie, Lannion, France
Simulations in a model eye (Zemax Opticstudio 18.4.1: LC C, Kirkland, Washington, USA) with four diffractive multifocal IOLs are presented to illustrate the continuous phase principle and its benefit for the patient. Comparison between one conventional bifocal IOL with +3D addition, one trifocal IOL with +1.75D/3.5D additions, and two complementary IOLs with patented new diffractive continuous phase profiles are presented in terms of defocus phase and simulated images from distance vision to 35 cm.
Bifocal IOL shows phase inversion between its two peaks whereas trifocal IOL suffers from phase inversion around 60 cm. New complementary IOLs demonstrate a continuous phase from 90 cm to 35 cm without compromising far distance. Simulated images decomposed in amplitude and phase as a function of distance of vision illustrate the visual consequences of phase continuity which ensures the readability of words. On the contrary blurred images are associated with phase inversion.
The importance of phase continuity is explained and illustrated for the first time. This information is useful to compare multifocal systems to correct presbyopia and appears essential to predict continuity of vision from near to intermediate distance. Results from an ongoing multicenter clinical study of the new pair of continuous phase IOLs confirm the continuity of a sharp vision at all distances, resulting in a defocus plateau curve from infinity to 35cm.
... is employed by a competing company, ... travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, ... research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, ... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented