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J.-C. Gavrilov, T. Gaujoux, C. I. Li Calzi, B. Ameline-Chalumeau, V. M. Borderie, L. Laroche; Posterior Corneal Curvature Measurements Before and After Myopic Lasik Using Visante Anterior OCT. Invest. Ophthalmol. Vis. Sci. 2009;50(13):559.
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© ARVO (1962-2015); The Authors (2016-present)
To compare the change in the radius of the posterior corneal curvature after myopic Laser In Situ Keratomileusis.
fifteen eyes of 15 consecutive patients undergoing myopic LASIK with ALLEGRETTO Eye-Q laser system (WaveLight Inc) had flaps created with the 60 kHz IntraLase femtosecond laser. Preoperatively and 3 months after surgery, posterior corneal curvature measurements were obtained using Visante OCT and were analysed by a custom computer algorithm written in Matlab 7.4 (The Mathworks, Inc.). Corneal hysteresis (CH) and corneal restistance factor (CRF) were measured using the Reichter ocular response analyser (ORA) preoperatively and 3 months afterwards.
Preoperative myopic spherical equivalent refraction was -3.77 D +/-1.24[SD]. Preoperative mean CH and mean CRF (10.6 mm Hg +/- 0.9 and 10.3 +/- 0.9 mm Hg, respectively) were significantly higher than postoperative values (8.8 +/- 0.7 mm Hg and 7.5 +/- 0.8 mm Hg, respectively) (P < .01). The mean thickness of the calculated residual stromal bed (RSB) after treatment was 330.2 microm +/- 36.4 (SD). The mean pre- and postoperative radius of posterior corneal curvature were 6.79 +/- 0.18 mm and 6.68 +/- 0.18 mm, respectively (P<0.05). Postoperative decrease in radius was correlated with the RSB (r = -0.27), but not with CH or CRF.
Analysis of the radius of the posterior corneal curvature was possible with the Visante OCT. the change in the radius was correlated with the RSB thickness
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