Posters

Impact of decentration on the optical performance of a non-rotational symmetric multifocal intraocular lens

Poster Details

First Author: L.Belda-Salmerón SPAIN

Co Author(s):    C. Ortiz   J. Esteve-Taboada   T. Ferrer-Blasco   R. Montés-Micó     

Abstract Details

Purpose:

To assess the in vitro optical quality of Lentis Mplus LS-312MF nonrotational symmetric multifocal intraocular lens (IOL) and analyze the effect of decentration in the both directions, vertical and horizontal.

Setting:

University of Valencia and University of Granada, Spain.

Methods:

The PMTF optical bench (Lambda-X Co) was used to test the Lentis Mplus LS-312MF (Oculentis GmbH) nonrotational symmetric +3.00 D aspheric multifocal IOL. This equipment allows to measure the modulation transfer function (MTF) by imaging an edge and then, processing the image. For the evaluation of the in vitro optical quality of the IOL, the MTF and the through-focus were measured both centered and after simulate lens decentration of 0.2 mm and 0.4 mm, for 3.0 m pupil diameter. Taking into account that the Lentis Mplus has a rotationally asymmetrical design, lens decentration was performed both upward and downward for the vertical direction and then, in the horizontal direction.

Results:

When the IOL was decentered in the vertical direction, the MTF values for the far focus decreased with the upward decentration, however increased with the downward decentration. On the other hand, the MTF values for the near focus increased when the IOL was decentered upward. The higher decentration, the more variation in MTF values. However, we found that when the IOL was decentered in the horizontal direction, the MTFs were similar to results in centered position. With respect to through-focus curves computed for a spatial frequency of 50 cycles/mm, a better peak value was obtained at the far-vision focal point when the IOL was decentered downward. Conversely, a better peak value was showed at the near-vision focal point when the IOL was decentered upward.

Conclusions:

The results showed that decentration had a significant impact on optical quality with nonrotational symmetric intraocular lens. This underlines the necessity of accurate centration when the IOL is implanted in order to minimize the negative postoperative effects in visual performance, satisfying the wearer's needs. FINANCIAL INTEREST: NONE