Back to Freepaper Session

Accuracy of preoperative software simulation of phakic iris-fixated intraocular lens position by Scheimpflug photography

Session Details

Session Title: Phakic IOL Implantation I

Session Date/Time: Tuesday 08/10/2013 | 14:00-16:00

Paper Time: 15:36

Venue: Main Lecture Hall (Ground Floor)

First Author: : T.Ferreira PORTUGAL

Co Author(s): :    J. Portelinha   J. Güell            Murta

Abstract Details

Purpose:

To analyze the value of the phakic intraocular lens (pIOL) simulation software included in the Pentacam HR (oculus optikgerate GmbH).

Setting:

Hospital Egas Moniz, Lisbon, Portugal

Methods:

In this retrospective study, patients with iris-fixated pIOL implantation (Artiflex and Artiflex toric – Ophtec BV) were evaluated. The distances between the pIOL and the endothelium (center of the pIOL optic, nasal, temporal, superior and inferior edges) and the pIOL and the crystalline lens predicted by the pIOL simulation software before surgery were compared to those obtained after surgery. The postoperative distances were measured at 3 months, 6 months, 1 year, 2 years and 3 years after surgery.

Results:

53 eyes of 30 patients were included. There were strong positive correlations between the distances predicted by the software and those observed at 3-months post-operatively for all the distances studied. Furthermore, there were no statistically significant differences between the distances predicted by the software and the post-operative distances apart from the temporal edge (p=.02) and the central distance (p=.02). There were strong negative correlations between the pupillary diameter and the anterior chamber depth and the differences between the values predicted by the software and the actual measurements at 3-months post-operatively for all the distances studied. There were strong positive correlations between the iris convexity and the differences between the distances predicted and those measured and 3-months post-operatively. There was a statically significant difference between the distances measured annually over the 3 years of follow-up and those predicted by the software (p<.001 for all distances).

Conclusions:

The pIOL simulation software included in the Scheimpflug imaging device was accurate in predicting the iris fixated pIOL position after surgery. This prediction was most accurate for deeper anterior chambers, larger pupils and smaller iris convexities. However, the pIOL position predicted by the software aging simulation showed significant differences to the postoperative position over time. Despite its limitations the pIOL prediction software is an additional tool to ensure the post-operative safety of iris-fixated pIOLs.

Financial Interest:

NONE