Corneal higher order aberrations after myopia and compound myopic astigmatism correction with single-step transepithelial PRK and alcohol-assisted PRK

Session Details

Session Title: Surface Photoablation

Session Date/Time: Sunday 06/09/2015 | 16:30-18:00

Paper Time: 17:36

Venue: Room 10

First Author: : B.Kaluzny POLAND

Co Author(s): :    J. Zborowska-Skrobanek   I. Cieslinska                 

Abstract Details

Purpose:

To evaluate corneal higher order aberrations (HOAs) after myopia and compound myopic astigmatism correction with single-step transepithelial PRK (TransPRK) and alcohol-assisted PRK with the use of aspheric aberration-neutral ablation profile.

Setting:

Oftalmika Eye Hospital, Department of Optometry of Collegium Medicum NCU, Bydgoszcz, Poland

Methods:

Of a total 159 eyes, 84 eyes underwent TransPRK and 75 eyes underwent alcohol-assisted PRK with Amaris 750S (Schwind, Germany). Mean preoperative manifest refraction spherical equivalent (MRSE) was -4.24 D ± 1.57 D and -3.99 D ± 1.81 D, respectively (P>0.05). Total corneal HOAs, corneal spherical aberrations (SA), corneal coma for a 6-mm pupil size were measured with a combined Placido-Scheimpflug imaging device preoperatively and 3 months after surgery.

Results:

In TransPRK group mean total HOAs RMS before the surgery was 0.41±0.11 and increased by 0.13±0.21, SA RMS was 0.23±0.07 and increased by 0.10±0.15, coma RMS was 0.25±0.12 increased by 0.03±0.15 (P<0.01). In PRK group respective values were 0.42±0.12 and 0.12±0.19, 0.24±0.07 and 0.08±0.15, 0.24±0.11 and 0.05±0.15 (P<0.01). The differences between groups in HOAs were not statistically significant. The increase in total HOAs RMS was negatively correlated with preop MRSE (Spearman coefficient -0.40673, P<0.01) and reached mean value of 0.29±0.22 in group of eyes with MRSE above -6.0 D.

Conclusions:

Three months postoperatively surgically induced corneal HOAs for large pupil size (6-mm) after myopia and compound myopic astigmatism correction were similar with TransPRK and alcohol-assisted PRK. They magnitude was correlated with preoperative MRSE.

Financial Interest:

One of the authors travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented