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Influence of ocular residual astigmatism on LASIK outcomes using solid-state technology

Session Details

Session Title: LASIK

Session Date/Time: Wednesday 09/10/2013 | 08:00-10:30

Paper Time: 09:46

Venue: Auditorium (First Floor)

First Author: : D.Pińero Llorens SPAIN

Co Author(s): :    R. Pérez-Cambrodķ   F. Blanes-Mompó   D. Ribera-Vicent   P. Ruiz-Fortes   A. Alzamora-Rodrķguez   A.

Abstract Details

Purpose:

To evaluate the impact of the preoperative ocular residual astigmatism (ORA) on the outcomes obtained with LASIK surgery for the correction of myopic astigmatic using the solid-state laser technology

Setting:

Oftalmar, Medimar International Hospital, Alicante, Spain

Methods:

101 consecutive eyes with low to moderate myopia and astigmatism of 55 patients that had undergone LASIK surgery using the Pulzar Z1 solid-state laser (CustomVis Laser Pty Ltd, currently CV Laser) were included. Visual and refractive changes at 6 months postoperatively as well as changes in ORA, calculated as the vectorial difference between refractive and corneal astigmatism, were analyzed.

Results:

A significant improvement in uncorrected distance visual acuity and a significant reduction of spherical equivalent was observed postoperatively (p<0.01). The magnitude of refractive cylinder changed significantly (p<0.01). In contrast, no significant changes were observed in the magnitudes of ORA (p=0.81) and anterior corneal astigmatism (p=0.12). Mean overall efficacy and safety indices were 0.96 and 1.01. These indices did not correlate significantly with preoperative ORA (r=-0.15,p=0.15). Furthermore, a significant correlation was found postoperatively between ORA (r=0.12, p=0.25) and posterior corneal astigmatism which was not present preoperatively (r=0.81, p<0.01). Significant correlation of ORA with manifest refraction was only found postoperatively (r=-0.38, p<0.01).

Conclusions:

The magnitude of the ORA does not seem to be a predictive factor for the efficacy and safety of solid-state assisted myopic LASIK. The potentially higher relevance of posterior corneal astigmatism after surgery seems to be crucial for the presence of unexpected astigmatic residual refractive errors

Financial Interest:

NONE