Posters

Corneal wavefront-guided vs aberration-free transepithelial photorefractive keratectomy in myopic patients with high pre-existing corneal higher order aberrations

Poster Details

First Author: M.Galal EGYPT

Co Author(s):    A. Ellakwa   R. Ashor                 

Abstract Details

Purpose:

Compare the efficacy, safety and predictability of corneal WFG and aberration free ablation in single-step transepithelial photorefractive keratectomy (TransPRK) in myopic patients with high pre-existing corneal higher order aberrations (HOAs).

Setting:

El- Hekma eye laser center in Menoufia governorate, Egypt.

Methods:

TransPRK was performed to eligible myopic patients with or without astigmatism with corneal HOAs more than 0.35 µ utilizing either aberration free or corneal WFG patterns provided by Schwind ORKCAM software (SCHWIND eye-tech-solutions GmbH and Co. KG, Kleinostheim, Germany). Uncorrected distance visual acuity (UDVA), manifest and cycloplegic refractions, best spectacle corrected distance visual acuity (CDVA), thorough slit lamp examination and corneal topography were assessed and repeated six months postoperatively.

Results:

Six months postoperatively, 97.6% and 100% of patients have achieved MRSE within ± 1D with 76.1% and 66.7% of have achieved UDVA of ≥20/20 in aberration free group and corneal WFG group respectively. Both groups showed increase in total corneal HOAs and spherical aberrations, with no significant difference in corneal WFG (p=0.5, p=0.2 respectively). In contrast, they were significantly higher postoperatively in the aberration free group (p=0.001, p=0.003 respectively). Coma and trefoil aberrations declined after corneal WFG technique, yet increased after aberration free one

Conclusions:

both aberration free and corneal WFG TransPRK are safe, effective and predictable in treatment of myopia in patients with high pre-existing corneal HOAs with better aberrometric outcomes in corneal WFG group.

Financial Disclosure:

None