title: Evaluation of the Results of Using Toric IOL in the Cataract Surgery of Keratoconus Patients.
abstract: OBJECTIVE
  To evaluate the results of using AcrySof toric intraocular lenses (IOLs) in the cataract surgery of patients with keratoconus (KCN).
  
  
  METHODS
  In this study, 23 eyes of 17 patients with KCN who underwent cataract surgery using the toric IOL were evaluated. The amount and axis of the corneal astigmatism were measured by manual keratometry, corneal topography, refractive map of the Pentacam, and equivalent K reading of the Pentacam in all patients.
  
  
  RESULTS
  The mean uncorrected visual acuity increased significantly 3 months after the surgery (P<0.01). The mean best-corrected visual acuity was 0.28±0.10 logMAR, 0.51±0.52 logMAR, and 0.83±0.55 logMAR before the surgery and 0.16±0.09 logMAR, 0.18±0.12 logMAR, and 0.35±0.13 logMAR after the surgery in the mild, moderate, and severe KCN groups, respectively (P<0.01). The mean IOL rotation was 2.50±1.18 degrees, 2.50±1.51 degrees, and 2.67±1.15 degrees in the mild, moderate, and severe KCN groups. The lowest mean absolute error was seen in the mild and moderate KCN groups with corneal topography-derived keratometry using the SRK/T formula and in the severe KCN group with corneal topography-derived keratometry and manual keratometry using the SRK/T and SRK II formulas.
  
  
  CONCLUSIONS
  The use of toric IOLs resulted in desirable vision and refraction in the cataract surgery of patients with nonprogressive KCN. As for determining the IOL power, it seems that keratometry derived from the 3 mm central zone in the axial map of corneal topography using the SRK/T formula has the lowest error.
authors.affiliation: Noor Ophthalmology Research Center (H.H., S.H., M.A.S.), Noor Eye Hospital, Tehran, Iran; Department of Optometry (A.Y.), School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran; and Department of Epidemiology (M.K.), School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Hassan
authors.initials: H
authors.lastname: Hashemi
authors.forename: Shahab
authors.initials: S
authors.lastname: Heidarian
authors.forename: Mohammad A
authors.initials: MA
authors.lastname: Seyedian
authors.forename: Abbasali
authors.initials: A
authors.lastname: Yekta
authors.forename: Mehdi
authors.initials: M
authors.lastname: Khabazkhoob
mesh_terms: D000368:Aged; D001251:Astigmatism / Q000209:etiology; D002387:Cataract Extraction / Q000379:methods*; D019781:Corneal Topography; D005260:Female; D006801:Humans; D007640:Keratoconus / Q000503:physiopathology / Q000601:surgery*; D019654:Lens Implantation, Intraocular / Q000379:methods; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification / Q000379:methods; D012029:Refraction, Ocular / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology