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Flap Thickness Evaluation after Incision with Carriazo Pendular microkeratome - OCT vs. Ultrasound Pachymetry

Breil P., Frisch L. H. J., Dick H. B.,
Johannes-Gutenberg-Universität Mainz, Universitäts-Augenklinik (Mainz)

Purpose: Evaluation of flap thickness in LASIK helps avoiding keratectasy. Beside ultrasoundpachymetry OCT (optical coherence tomography) has yielded increasing importance. We compared the two techniques concerning accuracy and reproducibility.
Methods: The flap thickness of 30 porcine eyes after cut with Pendular microkeratome was measured. Three measurements with two different ultrasoundpachymeter (corneal thickness minus residual stromal thickness) and three measurements with OCT (directly the cut of free flap) were performed.
Results: No flap complications were observed. Mean flap thickness measured with ultrasoundpachymetry was 142 ± 40 µm (Sonogage), 129 ± 37 µm (DGH 500), with OCT 179 ± 43 µm. Intraindividual comparison of the three measurements of each flap showed 64 % of the pachymetric eyes in a range of 10 µm, in OCT measurement 24 %.
Conclusion: The Carriazo Pendular produces flap thicknesses comparable to current microkeratomes. We observed no flap complications. Flap thickness measured with OCT was much higher with a larger intraindividual range compared to ultrasound pachymetry.

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