title: Epidemiology and outcomes in refractive lens exchange surgery.
abstract: OBJECTIVE
  To assess demographics and refractive outcomes in patients undergoing refractive lens exchange surgery (RLE), with a population of cataract patients as a reference.
  
  
  METHODS
  A RLE cohort from a private eye clinic (n = 675) and a cataract cohort from the outcome registration of the Swedish National Cataract Register were studied and compared from an epidemiological perspective regarding age, gender, preoperative refraction and postoperative refractive outcome.
  
  
  RESULTS
  The RLE patients were younger (52.1 ± 7.7 versus 73.84 ± 9.32 years) with a smaller percentage of women (45.28% versus 60.46%; p < 0.001) and were more often myopic than the cataract patients. Astigmatism and hyperopia did not differ between the cohorts. Uncorrected visual acuity after RLE equalled the best corrected visual acuity in best cases after cataract surgery. The absolute biometry prediction was more accurate in RLE (0.17 ± 0.27 D versus 0.40 ± 0.58 D; p < 0.001), particularly in patients given a customized toric IOL (0.12 ± 0.27 D; p < 0.05). In cataracts, the Haigis' formula showed higher accuracy than the SRK/T formula (0.39 ± 0.53 D versus 0.43 ± 0.61 D; p < 0.01). Postoperatively after RLE, Laser Epithelial Keratomileusis was performed in 9.04% and Yttrium Aluminium Garnet capsulotomy in 7.41% of the eyes. Other reoperations were performed in three cases, and five postoperative retinal detachments occurred after RLE.
  
  
  CONCLUSIONS
  Compared with patients undergoing cataract surgery, we see many similarities, but also many interesting differences in patients undergoing RLE. Basic information about the growing population choosing to undergo RLE can help us plan future ophthalmic care.
authors.affiliation: Department of Clinical Sciences/Ophthalmology, Umeå University Hospital, Umeå, Sweden.
authors.forename: Oscar
authors.initials: O
authors.lastname: Westin
authors.forename: Timo
authors.initials: T
authors.lastname: Koskela
authors.forename: Anders
authors.initials: A
authors.lastname: Behndig
mesh_terms: D000368:Aged; D001251:Astigmatism / Q000503:physiopathology / Q000601:surgery; D001699:Biometry; D002386:Cataract / Q000453:epidemiology; D015331:Cohort Studies; D016021:Epidemiologic Studies; D005260:Female; D006801:Humans; D006956:Hyperopia / Q000503:physiopathology / Q000601:surgery*; D019654:Lens Implantation, Intraocular / Q000706:statistics & numerical data*; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D018918:Phacoemulsification / Q000706:statistics & numerical data*; D012029:Refraction, Ocular / Q000502:physiology; D012042:Registries; D013548:Sweden / Q000453:epidemiology; D014792:Visual Acuity / Q000502:physiology
keywords: cataract; complications; refractive lens exchange; refractive outcome; results