Posters

Meeting high expectations: transepithelial photorefractive keratectomy (TE-PRK) for very low myopic and astigmatic corrections

Poster Details

First Author: A.Covello CANADA

Co Author(s):    D. Lin   S. Holland   S. Arba Mosquera   V. Shwetabh   M. Al Obthani   J. Tan     

Abstract Details

Purpose:

Patients may be frustrated by low myopic/astigmatic refractive errors or with residual refractions after premium cataract and laser refractive surgery. We aimed to evaluate TE-PRK for very low myopia and myopic astigmatism using the high speed, Schwind Amaris (SA) 1050 with SmartSurfACE.

Setting:

Laser Eye Centre

Methods:

Retrospective, consecutive case series study at laser refractive clinic. Case inclusion criteria were preoperative spherical equivalent (SE) of ≥-0.50D to ≤ -1.50D with ≤1.50D cylinder. Patients were treated with TE-PRK using SA1050 SmartSurfACE. A phototherapeutic keratectomy (PTK) of 55µm was used without measurement of epithelial thickness. Data analyzed: pre- and post-operative uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA) and spherical equivalent (SE) in eyes with sufficient data for analysis at 12 months.

Results:

82 eyes met the inclusion criteria. 21 eyes had undergone cataract and/or laser refractive surgery previously. Refractive improvement from pre-operative SE of -1.22±0.24D to post-operative SE +0.07±0.30D.  All cases achieved UDVA ≥20/40 at 12 months and 98% (83) achieved ≥20/25.  24% (20) gained one line or more of CDVA with 5% (4) lost 1 line. No complications occurred.

Conclusions:

Patients with very low myopic and myopic astigmatic refractive error may be effectively treated with TE-PRK using Schwind Amaris 1050 excimer laser. The technique may also applicable for correction of small degrees of residual refractive errors after premium cataract or laser refractive surgery with high predictability. Further improvement may be possible by adjusting for epithelial thickness.

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