Effects of laser in situ keratomileusis (LASIK) on corneal biomechanical measurements with the Corvis ST tonometer
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Effects of laser in situ keratomileusis (LASIK) on corneal biomechanical measurements with the Corvis ST tonometer. / Frings, Andreas; Linke, Stephan J; Bauer, Eva L; Druchkiv, Vasyl; Katz, Toam; Steinberg, Johannes.
In: CLIN EXP OPHTHALMOL, Vol. 9, 01.01.2015, p. 305-11.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Effects of laser in situ keratomileusis (LASIK) on corneal biomechanical measurements with the Corvis ST tonometer
AU - Frings, Andreas
AU - Linke, Stephan J
AU - Bauer, Eva L
AU - Druchkiv, Vasyl
AU - Katz, Toam
AU - Steinberg, Johannes
PY - 2015/1/1
Y1 - 2015/1/1
N2 - PURPOSE: This study was initiated to evaluate biomechanical changes using the Corvis ST tonometer (CST) on the cornea after laser in situ keratomileusis (LASIK).SETTING: University Medical Center Hamburg-Eppendorf, Germany, and Care Vision Refractive Centers, Germany.DESIGN: Retrospective cohort study.METHODS: 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.RESULTS: 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.CONCLUSION: 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.
AB - PURPOSE: This study was initiated to evaluate biomechanical changes using the Corvis ST tonometer (CST) on the cornea after laser in situ keratomileusis (LASIK).SETTING: University Medical Center Hamburg-Eppendorf, Germany, and Care Vision Refractive Centers, Germany.DESIGN: Retrospective cohort study.METHODS: 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.RESULTS: 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.CONCLUSION: 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.
U2 - 10.2147/OPTH.S76491
DO - 10.2147/OPTH.S76491
M3 - SCORING: Journal article
C2 - 25709393
VL - 9
SP - 305
EP - 311
JO - CLIN EXP OPHTHALMOL
JF - CLIN EXP OPHTHALMOL
SN - 1442-6404
ER -
