Posters

Refractive outcomes of cataract surgery in high myopia using SRK/T formula

Poster Details

First Author: P.Domínguez Castillo MEXICO

Co Author(s):    G. Cervantes Coste   A. Medina Andrade   M. Golzarri Millote              

Abstract Details

Purpose:

To define the refractive outcome of SRK/T formula used for IOL (Intraocular lens) power calculation in patients with axial length >26mm undergoing phacoemulsification surgery. • Define the residual spherical equivalent (SE) in 2 groups, Group 1(G1): Eyes with axial length >26mm and Group 2 (G2): Eyes with axial length >29 • Define the refractive outcome in 2 different groups,Group A (GA) eyes with keratometry of 38-44 D and Group B (GB) eyes with >44D

Setting:

Clinic number 4. Asociación para Evitar la Ceguera en México I.A.P. between January  2017 to February 2019.

Methods:

Observational, retrospective, transversal, descriptive study. Records of patients who had uncomplicated phacoemulsification were retrospectively reviewed. Inclusion criteria: Patients with previous diagnosis of cataract and high myopia (axial length >26mm) determine by USG (Ultrasonography) or IOLMaster, Use of SRK/T formula, Cataract surgery performed by phacoemulsification and in-the-bag IOL implantation, Refraction at least 3 months post-surgery. Exclusion criteria: Previous intraocular surgery, younger than 20 years old, phacoemulsification for ocular trauma, preexisting ocular diseases that may influence postoperative refraction.

Results:

The records of 55 eyes were reviewed. The mean residual SE (the difference between the target and real SE) in G1: -0.39±0.712 and G2: -1.87±0.97. Mean error (ME) G1: 0.4952±0.42031 and G2: 0.42031±1.0802. ME was calculated from the difference between the formula predicted refractive error and the actual postoperative refractive error. There were no statistically significant differences when comparing the SE result difference between GA-GB. 37 patients had a postoperative SE between -1 and 1D,18 had a SE result of less than -1 D. 46 had a ME of less than and 9 greater than 1D.

Conclusions:

By comparing the use of SRK/T formula between patients with axial length  between 26-29mm vs patients with axial length >29mm, we observed that the first group achieved a ME between -1.0 and 1D in more frequency that in the second group. The SRK/T formula is a good option in patients with high myopia, but we have to be careful in patients with an axial length >29mm.

Financial Disclosure:

None