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Positional accommodating intraocular lens power error induced by the estimation of the corneal power and the effective lens position

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Session Details

Session Title: Presented Poster Session 20: Cataract Surgery Outcomes 5

Session Date/Time: Tuesday 16/09/2014 | 09:30-11:00

Paper Time: 10:30

Venue: Pod 2 (Poster Village)

First Author: : D.Pinero SPAIN

Co Author(s): :    V. Camps   M. Ramón   V. Mateo   R. Pérez-Cambrodí     

Abstract Details


To evaluate the predictability of the refractive correction achieved with a positional accommodating IOL and to develop a potential optimization of such predictability by minimizing the error associated to the keratometric estimation of the corneal power and by developing a predictive formula for the effective lens position (ELP)


Department of Ophthalmology (Oftalmar), Medimar International Hospital, Alicante, Spain


Clinical data from 25 eyes of 14 patients (age range, 52-77 years) and undergoing cataract surgery with implantation of the accommodating IOL Crystalens HD (Bausch&Lomb) were retrospectively reviewed. In all cases, the calculation of an adjusted IOL power (PIOLadj) based on Gaussian optics considering the residual refractive error was done using a variable keratometric index value (nkadj) for corneal power estimation with and without using an algorithm for the estimation of ELP obtained by multiple regression analysis (ELPadj). PIOLadj was compared to the real IOL power implanted (PIOLReal, calculated with the SRK-T formula) and also to the values estimated by the Haigis, HofferQ and Holladay I formulas.


No statistically significant differences were found between PIOLReal and PIOLadj when ELPadj was used (p=0.10), with a range of agreement between calculations of 1.23 D. In contrast, PIOLReal was significantly higher when compared to PIOLadj without using ELPadj and also compared to the values estimated by the other conventional formulas.


Predictable refractive outcomes can be obtained with the accommodating IOL Crystalens HD by using a variable keratometric index for corneal power estimation and by estimating ELP with an algorithm dependent on anatomical factors and age.

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