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MTF performance of +2.50D-add apodized diffractive multifocal in the presence of tilt and decentration

Poster Details

First Author: J.Schwiegerling USA

Co Author(s):    S. Lane              

Abstract Details


To determine the effect of lens tilt and decentration on the optical performance for a +2.50D-Add aspheric apodized diffractive multifocal IOL.


University of Arizona, College of Optical Sciences


Line-spread measurements were used to calculate through-focus modulation transfer function (MTF) values with an aspheric +2.50D-Add multifocal IOL (ReSTOR SN6AD2, Alcon Laboratories). Entrance pupil diameters of 3mm and 5 mm were examined. The IOL was mounted in a saline-filled wet cell and inserted into an eye model with clinical levels of spherical and chromatic aberration. The blurred image of a slit was captured and analyzed for different object vergences to determine the MTF of the system. The IOL had a base power of 21D and an add power in the IOL plane of 2.50D. The through-focus measurements were performed with the IOL aligned, as well as tilted 2 degrees and 4 degrees, and decentrations up to 0.5 mm.


For a 3mm pupil, the aligned apodized diffractive multifocal lens had MTF values at 50 cyc/mm are 0.60 and 0.19 for distance and near vision, respectively. For a 5mm pupil, the aligned apodized diffractive multifocal lens had MTF values at 50 cyc/mm are 0.60 and 0.18 for distance and near vision, respectively. In the presence of 2 degrees, the through-focus MTF are nearly identical to the aligned case. Increasing the tilt to 4 degrees degrades MTF by 0.05 for distance and 0.08 for near at both pupil sizes. Decentration changes were small.


The apodized diffractive multifocal showed high performance for both distance and near vision with a bias towards distance vision. In addition, the lens design is insensitive to tilt levels up to two degrees, but performance is degraded for tilts somewhere between 2 and 4 degrees. The lens is also insensitive for decentrations up to 0.5 mm. FINANCIAL DISCLOSURE?: ... research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented

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