Posters

Comparison of toric intraocular lens alignment error with different toric markers

Poster Details

First Author: L.Lipsky ISRAEL

Co Author(s):    G. Barrett                    

Abstract Details

Purpose:

To compare the error in intraocular lens toric alignment of two toric markers: the Barrett dual axis toric marker and the Mendez gauge.

Setting:

Sir Charles Gairdner Hospital, Perth, Western Australia, Australia.

Methods:

In this retrospective cohort study, two consecutive groups of patients underwent cataract surgery by a single surgeon using a toric intraocular lens (TIOL), in two public hospitals. The only difference in the toric alignment methods between the groups was the toric maker used: group1- Barrett dual axis toric marker and group2- Mendez gauge. A mobile phone application ToriCAM was used in both groups to determine the reference meridian. The primary outcome evaluated was the error in TIOL alignment at 1 month. The secondary outcome was the percentage of eyes achieving a manifest refraction astigmatism within 0.5 diopter at one month.

Results:

72 eyes of 56 patients were included- Group1 36 eyes (35 patients), group2 36 eyes (25 patients). All eyes were implanted with a single model implant, Acrysof SN6AT2-T8.  The mean absolute toric alignment error defined as intended versus achieved axis of alignment was 4.0±2.9⁰ for group 1 and 8.4±6.5⁰ for group 2 (p=0.0015). Twenty-nine eyes (80.6%) achieved a manifest refractive astigmatism of 0.5 diopter or less in group1 versus twenty-one eyes (53.8%) in group2 (p<0.05).

Conclusions:

TIOL alignment utilizing the ToriCAM application was more accurate using the Barrett dual axis toric marker compared with the commonly used Mendez Gauge, with a significantly higher percentage of eyes achieving a manifest refractive astigmatism within half a diopter.

Financial Disclosure:

None