title: Comparison of higher-order aberrations after LASIK using disposable microkeratome 130 and 90 micron heads.
abstract: OBJECTIVE
  To analyze and compare higher-order aberrations (HOAs) in cases of laser in situ keratomileusis (LASIK) flaps made using the Moria M2 disposable 130-micronm head with those made using the 90-micronm head.
  
  
  METHODS
  Consecutive prospective comparative clinical trial. Ninety-four consecutive eyes of 48 patients were enrolled in this study. They were divided into two equal groups of 47 eyes that underwent wavefront-guided LASIK using VISX CustomVue (VISX, Santa Clara, CA) system. Corneal flap was created using the disposable Moria M2 130 micronm in the first group and the 90 micronm head in the second one. All patients were followed up for 6 months. Wavefront aberrations were measured at baseline, 1 month, and 6 months after surgery using the WaveScan (VISX Inc.) aberrometer. Root mean square (RMS) of HOAs, coma, and spherical aberration (SA) values were analyzed and compared in the two groups.
  
  
  RESULTS
  At 6 months, values of RMS of HOAs, coma, and SA obtained from the 130-micronm head group were 0.32+/-0.10 micronm, 0.20+/-0.11 micronm, and 0.18+/-0.08 micronm, respectively. Values of RMS of HOAs, coma, and SA obtained from 90-micronm head group were 0.33+/-0.12 micronm, 0.19+/-0.10 micronm, and 0.15+/-0.08 micronm, respectively. Analyzing the data obtained revealed no statistically significant differences between the two groups. In each group, there was a significant decay of higher-order RMS and coma values from 1 month to 6 months.
  
  
  CONCLUSIONS
  HOAs following use of Moria M2 disposable 90 micronm head are similar to those arising following use of the 130 micronm.
authors.affiliation: Department of Ophthalmology, Cairo University, Cairo, Egypt.
authors.forename: M
authors.initials: M
authors.lastname: Hosny
authors.forename: M A
authors.initials: MA
authors.lastname: Awadalla
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000503:physiopathology / Q000601:surgery; D003315:Cornea / Q000503:physiopathology; D005260:Female; D006801:Humans; D007431:Intraoperative Complications; D020731:Keratomileusis, Laser In Situ / Q000295:instrumentation / Q000379:methods*; D054018:Lasers, Excimer / Q000627:therapeutic use*; D008297:Male; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D011183:Postoperative Complications; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology*; D012030:Refractive Errors / Q000503:physiopathology; D013524:Surgical Flaps; D014792:Visual Acuity / Q000502:physiology*