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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.
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
Oftalmar, Medimar International Hospital, Alicante, Spain
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.
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).
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
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