April 2009
Volume 50, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2009
Posterior Corneal Curvature Measurements Before and After Myopic Lasik Using Visante Anterior OCT
Author Affiliations & Notes
  • J.-C. Gavrilov
    CHNO des Quinze-Vingts, Paris, France
  • T. Gaujoux
    CHNO des Quinze-Vingts, Paris, France
  • C. I. Li Calzi
    CHNO des Quinze-Vingts, Paris, France
  • B. Ameline-Chalumeau
    CHNO des Quinze-Vingts, Paris, France
  • V. M. Borderie
    CHNO des Quinze-Vingts, Paris, France
  • L. Laroche
    CHNO des Quinze-Vingts, Paris, France
  • Footnotes
    Commercial Relationships  J.-C. Gavrilov, None; T. Gaujoux, None; C.I. Li Calzi, None; B. Ameline-Chalumeau, None; V.M. Borderie, None; L. Laroche, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science April 2009, Vol.50, 559. doi:
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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)

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Abstract

Purpose: : To compare the change in the radius of the posterior corneal curvature after myopic Laser In Situ Keratomileusis.

Methods: : 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.

Results: : 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.

Conclusions: : 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

Keywords: refractive surgery: LASIK • imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) • imaging/image analysis: clinical 
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