title: Comparison and analysis of FDA reported visual outcomes of the three latest platforms for LASIK: wavefront guided Visx iDesign, topography guided WaveLight Allegro Contoura, and topography guided Nidek EC-5000 CATz.
abstract: OBJECTIVE
  To compare and analyze the differences in visual outcomes between Visx iDesign Advanced WaveScan Studio™ System, Alcon Wavelight Allegro Topolyzer and Nidek EC-5000 using Final Fit™ Custom Ablation Treatment Software from the submitted summary of safety and effectiveness of the US Food and Drug Administration (FDA) data.
  
  
  METHODS
  In this retrospective comparative study, 334 eyes from Visx iDesign, 212 eyes from Alcon Contour, and 135 eyes from Nidek CATz platforms were analyzed for primary and secondary visual outcomes. These outcomes were compared via side-by-side graphical and tabular representation of the FDA data. Statistical significance was calculated when appropriate to assess differences. AP-value <0.05 was considered statistically significant.
  
  
  RESULTS
  The mean postoperative uncorrected distance visual acuity (UDVA) at 12 months was 20/19.25±8.76, 20/16.59±5.94, and 20/19.17±4.46 for Visx iDesign, Alcon Contoura, and Nidek CATz, respectively. In at least 90% of treated eyes at 3 months and 12 months, all three lasers showed either no change or a gain of corrected distance visual acuity (CDVA). Mesopic contrast sensitivity at 6 months showed a clinically significant increase of 41.3%, 25.1%, and 10.6% for eyes using Visx iDesign, Alcon Contoura, and Nidek CATz, respectively. Photopic contrast sensitivity at 6 months showed a clinically significant increase of 19.2%, 31.9%, and 10.6% for eyes using Visx iDesign, Alcon Contoura, and Nidek CATz, respectively.
  
  
  CONCLUSIONS
  FDA data for the three platforms shows all three were excellent with respect to efficacy, safety, accuracy, and stability. However, there are some differences between the platforms with certain outcome measurements. Overall, patients using all three lasers showed significant improvements in primary and secondary visual outcomes after LASIK surgery.
authors.affiliation: HDR Research Center, Hoopes Vision, Salt Lake City, UT; Department of Ophthalmology and Visual Sciences, John A Moran Eye Center, University of Utah School of Medicine, Salt Lake City, UT.
authors.forename: Majid
authors.initials: M
authors.lastname: Moshirfar
authors.affiliation: University of Arizona College of Medicine Phoenix, Phoenix, AZ.
authors.forename: Tirth J
authors.initials: TJ
authors.lastname: Shah
authors.affiliation: McGovern Medical School, The University of Texas Health Science Center at Houston, TX.
authors.forename: David Franklin
authors.initials: DF
authors.lastname: Skanchy
authors.affiliation: HDR Research Center, Hoopes Vision, Salt Lake City, UT.
authors.forename: Steven H
authors.initials: SH
authors.lastname: Linn
authors.affiliation: University of Arizona College of Medicine Phoenix, Phoenix, AZ.
authors.forename: Paul
authors.initials: P
authors.lastname: Kang
authors.affiliation: Durrie Vision, Kansas City, KS, USA.
authors.forename: Daniel S
authors.initials: DS
authors.lastname: Durrie
keywords: LASIK; topography-guided; wavefront optimized; wavefront-guided