Outcome of photorefractive keratectomy vs laser-assisted in situ keratomileusis for myopia

Session Details

Session Title: LASIK

Session Date/Time: Monday 12/09/2016 | 08:00-10:30

Paper Time: 08:12

Venue: Hall C3

First Author: : S.Holland CANADA

Co Author(s): :    D. Lin   S. Mosquera                 

Abstract Details

Purpose:

To compare the outcome of myopic photorefractive keratectomy (PRK) and laser assisted in-situ keratomileusis (LASIK) using two different laser platforms at the 12 month postoperatively.

Setting:

Pacific Laser Eye Centre, Vancouver, BC, Canada

Methods:

Retrospective case series. The outcomes of 446 myopic transepithelial PRK (TE-PRK) eyes performed with Schwind Amaris (SA) were compared to 1798 myopic LASIK eyes performed with Wavelight Allegretto (WA) at 12 month follow-up. Analysis divided into moderate ( ≤8.00D) and high myopia (≥8.00D). Refractive and visual comparisons were performed for spherical equivalent (SE), uncorrected visual acuity (UCVA), corrected distance visual acuity (CDVA) and safety (change of CDVA from baseline).

Results:

At one year, SE: +0.15±0.5D for PRK (n=446), -0.10±0.4D for LASIK (n=1779), p=0.0003 in both groups UCVA≥20/20 achieved by 84%(328eyes) and 47%(27eyes) in moderate and high myopia of PRK-SA versus 74%(1218 eyes) and 33%(52 eyes) in LASIK-WA (p=0.02); UCVA≥20/40 achieved by 99%(384eyes) with PRK-SA and 89%(51eyes) in moderate and high myopia vs. 98%(1610eyes) and 88%(140eyes) in LASIK-WA (p=0.1). Two eyes gained ≥2 lines of vision in high myopia PRK-SA vs. none with LASIK-WA. Only 2 eyes lost ≥2 lines both with high myopia LASIK-WA (NS). No re-treatments in PRK-SA, 1%(19eyes) and 5%(8 eyes) in moderate and high myopia of LASIK-WA.(p=0.1).

Conclusions:

Uncorrected vision after myopic PRK with Schwind Amaris laser was significantly better than LASIK with Wavelight Allegretto for both moderate and high myopia at one year post-operatively with similar CDVA and safety. Surface ablation with trans epithelial PRK may be a better option than LASIK for moderate and extreme myopia avoiding issues such as post-LASIK ectasia.

Financial Disclosure:

... is employed by a for-profit company with an interest in the subject of the presentation, ... travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, ... receives consulting fees, retainer, or contract payments from a competing company