Minimization of an aspheric IOL power error by optimizing the estimation of the corneal power and the effective lens position

Session Details

Session Title: Pseudophakic IOLs: Monofocal. Cataract Surgery Instrumentation

Session Date/Time: Saturday 05/09/2015 | 16:00-18:30

Paper Time: 16:30

Venue: Room 10

First Author: : V.Camps Sanchis SPAIN

Co Author(s): :    D. Pinero   M. Ramon   V. Mateo   R. Soto-Negro           

Abstract Details

Purpose:

To evaluate the refractive predictability achieved with an aspheric intraocular lens (IOL) and to develop an optimized algorithm for IOL power (PIOL) calculation for this IOL.

Setting:

University of Alicante, Spain

Methods:

Retrospective study including 65 eyes implanted with the aspheric IOL LENTIS L-313 (Oculentis GmbH) that were divided into 2 groups as a consequence of the ELPadj optimization: 12 eyes (8 patients) with PIOL≥23.0 D (group A), and 53 eyes (35 patients) with PIOL<23.0 D (group B). The refractive predictability was evaluated at 3 months postoperatively. An adjusted IOL power (PIOLadj) was calculated considering a variable refractive index for corneal power estimation, the refractive outcome obtained, and an adjusted effective lens position (ELPadj) according to age and anatomical factors.

Results:

Two different expressions for ELPadj were obtained depending on de PIOLreal. Postoperative spherical equivalent ranged from -0.75 to +0.75 D and from -1.38 to +0.75 D in groups A and B, respectively. No statistically significant differences were found in groups A (p=0.64) and B (p=0.82) between PIOLadj and PIOLReal. The Bland and Altman analysis showed ranges of agreement between PIOLadj and PIOLReal of +1.11 to -0.96 D and +1.14 to -1.18 D in groups A and B, respectively. Clinically and statistically significant differences were found between PIOLadj and PIOL obtained with the Haigis, HofferQ and Holladay I formulas (p<0.01), except for the comparison between PIOLadj and PIOL with Haigis in group A (p=0.53).

Conclusions:

The refractive predictability of cataract surgery with implantation of the evaluated aspheric IOL can be optimized using paraxial optics, an algorithm to minimize the keratometric error and an adjustment of ELP according to IOL power, age and anatomical factors.a mathematical expression dependent on anatomical factors Financial disclosure: The authors have no proprietary or commercial interest in the medical devices that are involved in this manuscript.

Financial Interest:

NONE