title: Laser in situ keratomileusis results of DOS and windows software versions for the Nidek EC-5000 excimer laser using the same nomogram.
abstract: OBJECTIVE
  To compare the results of laser in situ keratomileusis (LASIK) correction for myopia and myopic astigmatism between the previous DOS software version and the Windows software version for the Nidek EC-5000 excimer laser, using the same nomogram.
  
  
  METHODS
  This retrospective review included 2021 eyes (980 patients) after LASIK using the Nidek EC-5000 excimer laser. Of these, 1,632 eyes were corrected with the DOS software version and the other 389 eyes were corrected with the Windows software version of the laser. Both groups were treated with the same surgical nomogram. Minimum follow-up time was 6 months. Patients were classified into range of myopia: low, moderate, and high.
  
  
  RESULTS
  Postoperative uncorrected visual acuity was not statistically significantly different between the two groups in any range of refractive error. There was no loss of best spectacle-corrected visual acuity for any patient. Uncorrected visual acuity equal to or better than 20/40 was achieved in 96.3% of eyes in the Windows version group and 94.9% in the DOS version.
  
  
  CONCLUSIONS
  Results for the correction of myopia or myopic astigmatism were similar using the Nidek EC-5000 excimer laser with either the DOS software version or Windows software version, with the same surgical nomogram.
authors.affiliation: Department of Ophthalmology, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand. anung@asiaaccess.net.th
authors.forename: A
authors.initials: A
authors.lastname: Vongthongsri
authors.forename: P
authors.initials: P
authors.lastname: Hanutsaha
authors.forename: P
authors.initials: P
authors.lastname: Naripthapan
authors.forename: R
authors.initials: R
authors.lastname: Lerdvitayasakul
mesh_terms: D000293:Adolescent; D000328:Adult; D001251:Astigmatism / Q000503:physiopathology / Q000601:surgery*; D003319:Corneal Stroma / Q000503:physiopathology / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000379:methods*; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D012189:Retrospective Studies; D012986:Software Validation; D013524:Surgical Flaps; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology