Effects of laser in situ keratomileusis (LASIK) on corneal biomechanical measurements with the Corvis ST tonometer

This study was initiated to evaluate biomechanical changes using the Corvis ST tonometer (CST) on the cornea after laser in situ keratomileusis (LASIK). University Medical Center Hamburg-Eppendorf, Germany, and Care Vision Refractive Centers, Germany. Retrospective cohort study. This retrospective s...

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Bibliographic Details
Published in:Clinical ophthalmology (Auckland, N.Z.) N.Z.), 2015-01, Vol.9 (default), p.305-311
Main Authors: Frings, Andreas, Linke, Stephan J, Bauer, Eva L, Druchkiv, Vasyl, Katz, Toam, Steinberg, Johannes
Format: Article
Language:English
Subjects:
Ablation
Analysis
Biomechanics
Cameras
Cataracts
Cornea
corneal biomechanics
Corvis ST
Deflection
Evaluation
Excimer lasers
Eye movements
Flaps
Health status indicators
Laser in situ keratomileusis
Lasers
LASIK
Medical examination
Ophthalmology
Original Research
Patient outcomes
Patients
Radius of curvature
refractive surgery
Surgery
Topography
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Summary:This study was initiated to evaluate biomechanical changes using the Corvis ST tonometer (CST) on the cornea after laser in situ keratomileusis (LASIK). University Medical Center Hamburg-Eppendorf, Germany, and Care Vision Refractive Centers, Germany. Retrospective cohort study. This retrospective study included 37 eyes of 37 refractive patients. All CST measurements were performed 1 day before surgery and at the 1-month follow-up examination. The LASIK procedure included mechanical flap preparation using a Moria SBK microkeratome and an Allegretto excimer laser platform. Statistically significant differences were observed for mean first applanation length, mean first and second deflection lengths, mean first and second deflection amplitudes, radius of curvature, and peak distance. Significant positive correlations were found between the change (Δ) of radius of curvature and manifest refraction spherical equivalent (MRSE), ablation depth, and Δintraocular pressure as well as between AD and ΔHC-time. Each diopter of myopic correction in MRSE resulted in an increase in Δradius of curvature of 0.2 mm. Several CST parameters were statistically significantly altered by LASIK, thereby indicating that flap creation, ablation, or both, significantly change the ability of the cornea to absorb or dissipate energy.
ISSN:1177-5467
1177-5483
1177-5483
DOI:10.2147/OPTH.S76491