Corneal flap thickness with the Moria M2 single-use head 90 microkeratome in 72 consecutive LASIK procedures

Abstract

PurposeThis study aimed to evaluate the accuracy and consistency of corneal flap thickness in laser-assisted in situ keratomileusis (LASIK) with the Moria M2 single-use head 90 microkeratome.MethodsThe central corneal thickness of 72 (37 right, 35 left) eyes of 37 patients was measured by ultrasonic pachymetry preoperatively and intraoperatively after flap cut. The Moria M2 single-use head 90 microkeratome was used to create a superior hinged flap in all eyes. The right eyes were always operated on before the left eyes in each patient, using the same blade in all bilateral cases. All patients underwent LASIK for myopia and/or myopic astigmatism using VISX Star S4 platform.ResultsThe mean preoperative spherical equivalent refraction was −3.55±2.30 D (range: −0.625 to −11.00 D), preoperative central corneal thickness by ultrasonic pachymetry was 541±26.82 µm (490–600 µm) and steepest K was 44.08±1.49 D (40–46.75 D) in all eyes. The mean flap thickness was 136.97±20.07 µm (106–192 µm), 131.2±19.5 µm (91–192 µm), and 134.16±19.85 µm (91–192 µm) in the right, left, and both eyes, respectively. A positive significant relationship was found between flap thickness and preoperative ultrasonic pachymetry thickness. No significant relationship was found between flap thickness and the age, preoperative spherical equivalent, and preoperative steepest K. The difference between the first and second eyes was not significant. There were no major intraoperative and postoperative complications in all eyes.ConclusionThe Moria M2 single-use head 90 microkeratome cut relatively thicker flaps than were intended. The flap thickness range was quite wide. This was a disadvantage for the accuracy and consistency of corneal flap thickness.

Analysis of Macular and Retinal Nerve Fiber Layer Thickness in Children with Refractory Amblyopia after Femtosecond Laser-assisted Laser In situ Keratomileusis

“…Currently, LASIK is the most popular surgery to treat refractive error. [ 1 2 3 4 ] It is safe and effective to use LASIK to treat refractive amblyopia. [ 5 6 7 8 9 ] However, the perioperative suction can cause elevation of the IOP to a level greater than 65 mmHg.…”

“…Laser in situ keratomileusis (LASIK) has been widely used to treat refractive error in adults since 1990. [ 1 2 3 4 ] It is safe and effective for the treatment of amblyopia because of severe anisometropia in children. [ 5 6 7 8 9 ] Previous studies have shown mild, reversible, and localized macular edema and thinning of the retinal nerve fiber layer (RNFL) soon after LASIK in adults.…”

Comparative study between LASIK procedures using ultra-thin Moria sub-Bowman keratomileusis (SBK) 90, Moria M2 90 microkeratomes, and femto- LASIK regarding visual acuity

“…The Moria-Plus SBK microkeratome forms a corneal flap with a nasal hinge of 8.5-9.0 mm in diameter. This device is utilized to test a central flap thickness of 110 m with a head accuracy of 90 m [5].…”

Efficiency of Moria One-Use Plus Sub-Bowman’s Keratomileusis Head in Achieving Predicted Corneal Flap Thickness in Sub Bowmans Keratomileusis

“…First critical step during LASIK surgery is creation of successful flap of adequate thickness. 5 Excellent LASIK outcomes require safe, predictable, and reproducible flap parameters. 6,7 Great attention must be given to improve the predictability and to minimize the degree of variation in corneal flap thickness, which is directly related to LASIK predictability and safety.…”