Review of the visual outcomes following trans-photorefractive keratectomy on an advanced excimer laser platform

Session Details

Session Title: Surface Photoablation

Session Date/Time: Monday 12/09/2016 | 14:30-16:30

Paper Time: 15:27

Venue: Hall C1

First Author: : S.Mughal UK

Co Author(s): :    A. Hamid                    

Abstract Details

Purpose:

To evaluate the clinical outcomes in terms of the efficacy, safety and stability of Trans-PRK utilising the Aberration-Free™ algorithm of the SCHWIND AMARIS laser’s ORK-CAM software (SCHWIND eye-tech-solutions GmbH, Kleinostheim, Germany).

Setting:

One certified and experienced corneal laser surgeon practicing in Optimax Laser Eye Clinics, United Kingdom performed all the surgeries.

Methods:

This was a retrospective analysis of 171 eyes of patients whose mean age was 31 years (range 19 to 58 years) who underwent Trans-PRK. All eyes underwent ablation at a repetition rate of 750 Hz pulse with 1050 Hz eye tracking. The laser ablation was centred on the pupillary axis. The intended refractive aim for all eyes was emmetropia and there were no retreatments included. All eyes had complete pre & postoperative 3 months of visual and refractive data. Uncorrected distance visual acuity (UDVA) and manifest refraction were evaluated at 3 months.

Results:

At 3 months, the preoperative manifest sphere was reduced from -3.40 ± 1.30 D (range: -0.75 to -6.75 D) to +0.06 ± 0.18 D (range: -1.75 to +1.50 D) and the astigmatism was reduced from -0.64 ± 0.57 (range: 0 to -3.00 D) to -0.25 ± 0.28 D (range: 0 to -1.50 D). The manifest spherical equivalent was within ± 0.50 D of emmetropia in 94% of eyes and UDVA of 20/25, 20/20, 20/16 or better was achieved in 93%, 84% & 37% respectively. There was no loss of 2 or more lines of corrected distance visual acuity (CDVA) and 32% of eyes gained an extra line of CDVA.

Conclusions:

Trans-PRK aberration-free treatments for myopia with or without astigmatism treated on the SCHWIND AMARIS platform yield very safe, predictable and satisfactory visual outcomes. The all laser method allows precise ablations to be carried out without the use of alcohol. Short term follow up at 3 months also indicates refractive stability and corneal haze development is clinically not significant. Longer follow-up is necessary to assess the long term stability following Trans-PRK.

Financial Disclosure:

NONE