Cataract surgery after topography-guided laser: IOL calculation and refractive results

Session Details

Session Title: IOL Power Calculations

Session Date/Time: Sunday 11/09/2016 | 16:00-18:00

Paper Time: 17:32

Venue: Hall C2

First Author: : A.Silva PORTUGAL

Co Author(s): :    J. Marques   E. Costa   A. Martins Rosa   C. Tavares   M. Quadrado   J. Neto Murta     

Abstract Details

Purpose:

The purpose of this study was (1) to evaluate postoperative refractive results of cataract surgery after topography-based customized ablation (T-CAT) and (2) to analyze the influence of T-CAT in the accuracy of intraocular lens (IOL) power calculation.

Setting:

Department of Ophtalmology, Centro Hospitalar e Universitário de Coimbra (CHUC), Coimbra, Portugal; Unidade de Oftalmologia de Coimbra (UOC), Idealmed, Coimbra, Portugal; Faculty of Medicine, University of Coimbra, Portugal.

Methods:

Multicenter retrospective case series in which we reviewed consecutive eyes that underwent uncomplicated cataract surgery ≥6 months after T-CAT PRK. IOL calculation was achieved using the IOL Master software. Pentacam scans and Holladay EKR measurements were also performed. Four-week postoperative outcomes were chosen as final best-corrected visual acuity (BCVA) results. The data were analyzed to determine median absolute error (MedAE), mean absolute error (MAE) and percentage of eyes within a certain refractive prediction error (spherical equivalent ≤-0.50D, ≤-1.00D, ≤-1.50D e >-1.50D).

Results:

A total of 8 eyes from 6 patients (12.5% males), mean aged 56 ± 8.0 years old (range 47-66 years old) were included in the study. The motive behind the T-CAT procedure was corneal irregularities after refractive surgery (including cases of PRK, LASIK and radial keratotomy). Using the 4-week refraction data, a spherical equivalent ≤-0.50D was found in 1 eye (12.5%), ≤-1.00D in 3 eyes (37.5%), ≤-1.50D in 4 eyes (50%) e >-1.50D in 4 eyes (50%). The MAE was 1.359D and the MedAE was 1.438D (min 0.38D; max 2.25D).

Conclusions:

This is the first study evaluating postrefractive IOL calculations in eyes that underwent cataract surgery after T-CAT and shows that there is wide space for improvement in IOL calculation after topography guided ablations. Obtaining historical treatment data could add to the accuracy of IOL prediction power. Intraoperative aberrometry will possibly be, in the near future, a major technical aid to improve refractive outcomes.

Financial Disclosure:

NONE