Precision, Morphology, and Histology of Corneal Flap Cuts Using a 200-kHz Femtosecond Laser

Abstract

Flap creation could be performed easily without any complications. The morphology and accuracy of the cuts were very reliable and precise. Histology showed a smooth cut.

Comparison of Corneal Flap Morphology Using AS-OCT in LASIK With the WaveLight FS200 Femtosecond Laser Versus a Mechanical Microkeratome

“…Yao et al 9 found that the mean fl ap thickness at 1 week postoperatively was 114.2 ± 6.93 μm with VisuMax intended for 100 and 127.9 ± 7.57 μm using the Moria microkeratome with an intended thickness of 110 μm. In terms of the accuracy and reproducibility of the central fl ap thickness, the results of the WaveLight fl aps observed in this study were consistent with an in vitro porcine study 14 (mean fl ap thickness: 96.3 ± 7.45 μm; intended thickness: 100 μm). In this study, no signifi cant difference in central fl ap thickness was found between the right and left eyes in the WaveLight group, but the right eye fl aps were signifi cantly thicker than the left eye fl aps in the Moria group.…”

Digital analysis of flap parameter accuracy and objective assessment of opaque bubble layer in femtosecond laser-assisted LASIK: a novel technique

“…However, it is noted that in a similar study12 involving porcine cadaver eyes and the prototype 200 kHz femtosecond laser UltraFlap (WaveLight GmbH, Erlangen, Germany), the successor of which is the FS200 femtosecond laser (Alcon, Fort Worth, Texas), a positive bias of approximately +0.03 to +0.06 mm was found for all flap diameters, and the flap diameter precision was found to correspond to a larger standard deviation (±0.10 to ±0.15 mm). This wider uncertainty may be attributed to the fact that the study was conducted using mechanical measurements (sliding caliper).…”

Three-dimensional LASIK flap thickness variability: topographic central, paracentral and peripheral assessment, in flaps created by a mechanical microkeratome (M2) and two different femtosecond lasers (FS60 and FS200)

“…Despite the fact that multiple generations of femtosecond lasers for refractive surgery have been introduced so far, and while the “perfect LASIK flap” is becoming increasingly tangible, the field continues to welcome research on the comparative characteristics of the femtosecond laser versus mechanical microkeratome flap, including that on morphology, cut accuracy, flap thickness reproducibility, flap-edge quality, stromal-bed surface roughness, and histopathology 19–25…”