Posters

Clinical outcomes of photorefractive keratectomy in myopic patients with high keratometry reading

Poster Details

First Author: A.Eslampoor IRAN

Co Author(s): S. Zarei Ghanavati   S. Askari                 

Abstract Details

Purpose:

To determine and compare post-Photorefractive Keratectomy (PRK) outcomes in patients with high keratometry reading (high-KR).

Setting:

This is a prospective case-control study, cases (n=67 eyes) were subjects with high keratometry-reading (K-max ≥47.2 diopters) and the control group (n=82 eyes) were with normal keratometry reading (K-max ˂47.2 diopters) who underwent PRK in an identical protocol.

Methods:

Inclusion criteria were normal corneal topography, spherical equivalent≤ -7.5 diopters , cylindrical errors ≤-4.00 D, stable refractive status for at least one year. Slit-lamp biomicroscopy , dilated fundoscopy,corneal tomography (Orbscan IIz, Bausch & Lomb), and ocular aberrometry (Zywave, Bausch & Lomb) were performed in all patients preoperatively. PRK was performed using the aspheric profile of the Technolas 217z laser platform (Bausch & Lomb) with an optical zone of 6.50 mm. Twelve months post-operation data including refraction, uncorrected visual acuity, best-corrected visual acuity, contrast sensitivity and wavefront analysis were compared in the both groups.Data analysis were done in SPSS.16 software.

Results:

Postoperative spherical equivalent was not statistically significant between two groups.The mean UCVA at 12 months was 0.05 ± 0.18 logMAR in the high-KR group and 0.00 ± 0.02 logMAR in the normal-KR group that was not statistically significantly different.The mean postoperative BCVA at 12 months was 0.02 ± 0.05 logMAR in the high-KR group and 0.00 ± 0.01 logMAR in the normal-KR group with no statistically significantly difference.The difference between the two groups was not statistically significant in the pre- and post-operative CS measurement in all spatial frequencies. There was no significantly difference in postoperative higher-order aberrations (HOAs) between groups.

Conclusions:

PRK is a safe and effective treatment in patients with high keratometry and low to moderate myopia and myopic astigmatism. Although high keratometry is considered as a risk factor for keratorefractive surgery, our results showed acceptable clinical results in short term in KRS candidates with high keratometry and completely normal topogarphic and tomographic findings. However long term follow up is recommended in this subgroup.

Financial Disclosure:

None