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A comparison of visual and refractive outcomes following the implantation of either a plate haptic or open loop haptic acrylic toric intraocular lens in eyes with high corneal astigmatism (>2.50D)

Poster Details

First Author: O.Erikitola UK

Co Author(s):    D. Lyall   A. Fern                 

Abstract Details

Purpose:

To compare visual and refractive outcomes following implantation of either an aspheric open- loop haptic, hydrophobic acrylic toric intraocular lens (IOL), or an aspheric plate-haptic hydrophilic acrylic (hydrophobic coated) toric IOL during cataract surgery in eyes with regular corneal astigmatism greater than 2.5 Dioptres (D).

Setting:

Department of Ophthalmology, Hairmyres Hospital, NHS Lanarkshire, Scotland

Methods:

Comparative, non-randomised, interventional study. 107 eyes of 106 patients with a mean age of 73.0 �Â�± 10.12 years who had more than 2.5D of regular corneal astigmatism when measured using optical biometry (IOL Master 700, Carl Zeiss Meditec, Jena, Germany) were enrolled. All patients underwent uncomplicated cataract surgery with implantation of a customized toric IOL, in the form of a hydrophobic open-loop toric IOL (AcrySof IQ toric SN6AT6-9 IOL, Alcon, Fort Worth, TX) or a hydrophilic (hydrophobic coated) plate-haptic toric IOL (AT TORBI 709M/MP, Carl Zeiss Meditec, Jena, Germany) into the capsular bag. All underwent refraction six weeks following surgery.

Results:

60 patients underwent an open-loop haptic toric IOL implantation. 47 patients had a plate haptic toric IOL implanted. Pre-operative corneal astigmatism of the cohort was 3.52D�Â�±1.22D. The mean pre-operative refractive cylindrical error was 4.20D�Â�±2.40D and 2.86D �Â�±1.58D in the open-loop, and plate haptic IOL groups respectively. Mean post-operative refractive cylindrical error improved to 1.17D�Â�±0.77D in the open-loop haptic IOL group and 0.60D �Â�±0.44D in the plate haptic IOL groups respectively (p<0.01). Uncorrected visual acuity improved from 0.46�Â�±0.38 and 0.99�Â�±0.76 (logMAR) pre-operatively to 0.15�Â�±0.13 and 0.10�Â�±0.14 post-operatively in the open-loop haptic and plate haptic IOL groups respectively (p<0.01).

Conclusions:

There was no difference when comparing visual or refractive outcomes between the two groups. All IOLs remained stable post-operatively with no cases requiring lens repositioning.The use of either an aspheric plate-haptic hydrophilic acrylic (with hydrophobic surface) toric IOL or an aspheric open-loop haptic hydrophobic acrylic toric IOL is a predictable and effective method to correct high, regular pre-existing corneal astigmatism at the time of cataract surgery.

Financial Disclosure:

NONE

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