Evaluation of higher-order aberrations after q-value-guided LASIK for myopia

Session Details

Session Title: Photoablation

Session Date/Time: Tuesday 13/09/2016 | 14:00-16:00

Paper Time: 14:30

Venue: Hall C2

First Author: : F.Neves PORTUGAL

Co Author(s): :    L. Figueiredo   J. Costa   T. Pacheco   C. Arede           

Abstract Details

Purpose:

To evaluate visual acuity and induced higher-order aberrations (HOA) after Q-value guided laser in situ keratomileusis (LASIK) for the treatment of myopia.

Setting:

Department of Ophthalmology of Centro Hospitalar Vila Nova de Gaia/Espinho.

Methods:

In this retrospective study we reviewed all patients with myopia submitted to LASIK using Zyoptix aspheric algorithm between 2008 and 2013. This algorithm incorporates the asphericity of the cornea (Q-value), the corneal curvature (K-value) and the manifest refractive error to create an ablation pattern. LASIK was performed with Technolas 217z100® system (Bausch & Lomb). Corneal HOA as well as efficacy and safety were evaluated 3 months after surgery.

Results:

Eighty-two eyes of 43 patients aged 31.6±5.9 years were included. Median spherical equivalent (SE) was -3.75D (range: -2.13 to -7.50) with a median cylinder of -0.25D. Three months after surgery, all eyes had their SE within 1.00D of emmetropia and 91.4% within 0.50D. For a 6-mm pupil diameter, median spherical aberration was 0.12 (range: 0 to 0.35) and coma was 0.12 (range: 0.003 to 0.64). Mean Q and K values were -0.16±0.04 and 43.29±1.34 respectively. HOA root mean square increased for both 5-mm and 6-mm pupil (p<0,001). There was no significant increase in primary spherical aberration (p=0,398) and coma (p=0,071).

Conclusions:

Although total higher-order aberrations increased, the aspheric algorithm was effective in reducing induced coma and spherical aberrations for myopic LASIK, and therefore, useful to enhance refractive outcomes.

Financial Disclosure:

NONE