LASIK and PRK in hyperopic astigmatic eyes: is early retreatment advisable?
Authors Frings A, Richard G, Steinberg J, Druchkiv V, Linke S, Katz T
Received 25 October 2015
Accepted for publication 12 December 2015
Published 31 March 2016 Volume 2016:10 Pages 565—570
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 3
Editor who approved publication: Dr Scott Fraser
Andreas Frings,1 Gisbert Richard,1,2 Johannes Steinberg,1,3,4 Vasyl Druchkiv,1,4 Stephan Johannes Linke,1,3,4 Toam Katz1,4
1Department of Ophthalmology, University Medical Centre Hamburg-Eppendorf, 2Ophthalmologikum an der Alster, 3zentrumsehstärke, 4CARE Vision Germany GmbH, Hamburg, Germany
Purpose: To analyze the refractive and keratometric stability in hyperopic astigmatic laser in situ keratomileusis (LASIK) or photorefractive keratectomy (PRK) during the first 6 months after surgery.
Patients and methods: This retrospective cross-sectional study included 97 hyperopic eyes; 55 were treated with LASIK and 42 with PRK. Excimer ablation for all eyes was performed using the ALLEGRETTO excimer laser platform using a mitomycin C for PRK and a mechanical microkeratome for LASIK. Keratometric and refractive data were analyzed during three consecutive follow-up intervals (6 weeks, 3 months, and 6 months). The corneal topography was obtained using Scheimpflug topography, and subjective refractions were acquired by expert optometrists according to a standardized protocol.
Results: After 3 months, mean keratometry and spherical equivalent were stable after LASIK, whereas PRK-treated eyes presented statistically significant (P<0.001) regression of hyperopia. In eleven cases, hyperopic regression of >1 D occurred. The optical zone diameter did not correlate with the development of regression.
Conclusion: After corneal laser refractive surgery, keratometric changes are followed by refractive changes and they occur up to 6 months after LASIK and for at least 6 months after PRK, and therefore, caution should be applied when retreatment is planned during the 1st year after surgery because hyperopic refractive regression can lead to suboptimal visual outcome. Keratometric and refractive stability is earlier achieved after LASIK, and therefore, retreatment may be independent of late regression.
Keywords: hyperopia, astigmatism, regression, keratometry
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