Long-term outcomes of Q-value-guided LASIK for high myopia: evaluation of higher order aberrations

Session Details

Session Title: Refractive
Session Date/Time: Friday 10/02/2017 | 10:30-12:30
Paper Time: 10:30
Venue: Brussels Room 0.4

First Author: F.Sousa Neves PORTUGAL
Co Author(s): L. Figueiredo  J. Costa  C. Santos  T. Pacheco  C. Arede  J. Sequeira  

Abstract Details

Purpose:

To evaluate long-term outcomes (visual acuity and induced higher-order aberrations) of Q-value guided laser in situ keratomileusis (LASIK) for the treatment of high myopic eyes.

Setting:

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

Methods:

In this retrospective study we reviewed all patients with high myopia submitted to LASIK using Zyoptixﾮ aspheric algorithm between 2008 and 2012. 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 217z100ﾮ system (Bausch & Lomb). Total higher-order aberrations (HOA) as well as efficacy and safety were evaluated 3 months and at least 48 months after surgery.

Results:

Eighty-one eyes of 46 patients aged 31.5ﾱ6.55 years were included. Median spherical equivalent(SE) was -5.25D (range: -4.00 to -7.50). Two evaluations were carried out: 3 months and 84.0ﾱ16.5 months. One and 4 eyes had a SE over 1.00D of emmetropia at 3-month and final evaluation respectively. Percentage of eyes within 0.50D of emmetropia was 82.7% and 77,8% at first and last visit. Baseline median spherical aberration (SA) was 0.14 and vertical coma (VC) was 0.12. HOA root mean square showed a significant progressive increase(p<0,001). A statistically relevant increased was noticed for SA between 3-month and final assessment(p=0,001)

Conclusions:

Q-value guided LASIK for high myopia induced new HOA and was proven to increase primary spherical aberration at a long-term. However, the aspheric algorithm was effective in reducing induced vertical coma, and therefore, could be useful to enhance refractive outcomes.

Financial Disclosure:

None