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Y. Luo, Y. Li; Corneal Flap Thickness Measurement With Fourier-Domain Optical Coherence Tomography After Myopic LASIK. Invest. Ophthalmol. Vis. Sci. 2009;50(13):906.
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© ARVO (1962-2015); The Authors (2016-present)
To assess the accuracy and reproducibility of Fourier-domain optical coherence tomography in the measurement of central corneal flap thickness in laser in situ keratomileusis (LASIK) by using Moria M2 microkeratome.
Fifteen myopic patients (30 eyes), mean age 29.5 years, underwent bilateral LASIK with a superior hinged flap using the Moria M2 microkeratome (90-microm single use head). The left eye was always operated first and the right eye second, using the same blade. The central corneal flap thickness (CCFT) was measured after 1 month by the same examiner, using FD-OCT (RTVue, Optovue Inc., Fremont, CA) with anterior segment adaptor.
The flap interface was demonstrated by FD-OCT. The mean post operative central corneal thickness(CCT) was measured as 454 +/- 30 micron by FD-OCT and 467 +/- 32 microm by ultrasound pachymetry. The mean postoperative CCFT was 123 +/- 16 micron (ranging 105 to 149 micron) and 129 +/- 18 micron (ranging 110 to 151 micron) by FD-OCT for right and left eyes, respectively.
The present data showed that FD-OCT not only provides quantitative measurement of CCT and CCFT but also presents clear images of postoperative central corneal flat. The measurement of CCT byFD-OCT with anterior segment adaptor was slightly lower than the measurement by ultrasonic pachymetry consistently. The corneal flaps by Moria M2 90-microm single use head were actually thicker than generally expected, based on FD-OCT data. This information may be critical for planning LASIK enhancements.
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